asset_type: tolerance

body: The accuracy every commercial device that sells fuel or energy in the United States has to hold, taken from NIST Handbook 44 -- the specifications and tolerances that state weights-and-measures programs adopt by reference and enforce when they inspect a gas pump. Each record is one row of one tolerance table: the commodity or device the row covers, its accuracy class, and the three limits the handbook prints for it. Answers 'how accurate does a gas pump have to be' (a retail petrol or diesel dispenser is Accuracy Class 0.5: 0.5 % once in service, 0.3 % when newly installed), 'is a new dispenser held to a tighter standard than one already in service' (yes -- the acceptance tolerance for a new or newly repaired device is tighter than the maintenance tolerance that applies afterwards), and the same question for propane, anhydrous ammonia, CNG, hydrogen, liquid CO2, cryogenic products and EV chargers. Covers Handbook 44 sections 3.30 (liquid-measuring devices), 3.31 (vehicle-tank meters), 3.32 (LPG and anhydrous ammonia), 3.33 (hydrocarbon gas vapor), 3.34 (cryogenic), 3.37 (mass flow meters), 3.38 (carbon dioxide), 3.39 (hydrogen) and 3.40 (electric vehicle fueling systems). Three things to read alongside the numbers. First, the handbook footnotes that special test tolerances do not apply to retail motor fuel or retail Diesel Exhaust Fluid dispensers at all, so the special-test column in section 3.30 is not a limit a filling-station pump is held to; that footnote is carried here as its own record. Second, the Accuracy Class 0.5 percentages stop applying on a small test draft: in section 3.30, a draft of 40 L (10 gal) or less is held to a volume figure instead of a percentage, and in section 3.31 to 6 in3 for a 5 gallon draft and 11 in3 for a 10 gallon one. The section 3.30 version of that exception is a record here. Third, this is a first pass over a source published only as a PDF: a table row is included only where the device, the class and the printed limits sit in one continuous run of text, so a handful of rows whose bullets are split across a page break by the PDF's running footer are not yet here -- section 3.30's Accuracy Class 0.3 row is the notable omission, and the equivalent row is present from sections 3.31 and 3.37. Nothing is reconstructed across a break; a row we cannot quote whole is left out.

key_field: application

licence: NIST Handbook 44 is a work of the US federal government and carries no copyright. Values are quoted with the section they appear in and link back to the NIST-hosted PDF.

title: How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)

type: dataset


body:
**Device or commodity:** Asphalt at temperatures greater than 50 °C (122 °F)

**Accuracy class:** 0.3A

**Acceptance tolerance (new or newly repaired device):** 0.3 %

**Maintenance tolerance (device already in service):** 0.3 %

**Special test tolerance:** 0.5 %

**Handbook 44 section:** 3.30. Liquid-Measuring Devices

**Edition:** 2026

> 0.3A - Asphalt at temperatures greater than 50 °C (122 °F) 0.3 % 0.3 % 0.5 %

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-330>

handbook_section: 3.30. Liquid-Measuring Devices

title: Asphalt at temperatures greater than 50 °C (122 °F) · 0.3A · 3.30. Liquid-Measuring Devices — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)

type: tolerance


application: Agri-chemical liquids

body:
**Device or commodity:** Agri-chemical liquids

**Accuracy class:** 0.5

**Acceptance tolerance (new or newly repaired device):** 0.3 %

**Maintenance tolerance (device already in service):** 0.5 %

**Special test tolerance:** 0.5 %

**Handbook 44 section:** 3.30. Liquid-Measuring Devices

**Edition:** 2026

> - Petroleum products delivered from small capacity (at 4 L/min (1 gpm) through 115 L/min or 30 gpm)** motor-fuel devices 0.5* 0.3 % 0.5 % 0.5 % - Agri-chemical liquids - All other applications not shown in the table where the typical delivery is ≤ 200 L (50 gal)

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-330>

title: Agri-chemical liquids · 0.5 · 3.30. Liquid-Measuring Devices — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** Petroleum products delivered from small capacity (at 4 L/min (1 gpm) through 115 L/min or 30 gpm)** motor-fuel devices

**Accuracy class:** 0.5

**Acceptance tolerance (new or newly repaired device):** 0.3 %

**Maintenance tolerance (device already in service):** 0.5 %

**Special test tolerance:** 0.5 %

**Handbook 44 section:** 3.30. Liquid-Measuring Devices

**Edition:** 2026

> - Petroleum products delivered from small capacity (at 4 L/min (1 gpm) through 115 L/min or 30 gpm)** motor-fuel devices 0.5* 0.3 % 0.5 % 0.5 % - Agri-chemical liquids - All other applications not shown in the table where the typical delivery is ≤ 200 L (50 gal)

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-330>

title: Petroleum products delivered from small capacity (at 4 L/min (1 gpm) through 115 L/min or 30 gpm)** motor-fuel devices · 0.5 · 3.30. Liquid-Measuring Devices — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** Devices designed to deliver less than 1 gal

**Accuracy class:** 1.1

**Acceptance tolerance (new or newly repaired device):** 0.75 %

**Maintenance tolerance (device already in service):** 1.0 %

**Special test tolerance:** 1.25 %

**Handbook 44 section:** 3.30. Liquid-Measuring Devices

**Edition:** 2026

> - Petroleum products and other normal liquids from 1.1 devices with flow rates** less than 1 gpm. 0.75 % 1.0 % 1.25 % - Devices designed to deliver less than 1 gal

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-330>

title: Devices designed to deliver less than 1 gal · 1.1 · 3.30. Liquid-Measuring Devices — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


application: test drafts ≤ 40 L or 10 gal

body:
**Device or commodity:** test drafts ≤ 40 L or 10 gal

**Accuracy class:** 0.5

**Acceptance tolerance (new or newly repaired device):** one-half the maintenance tolerance values

**Maintenance tolerance (device already in service):** 20 mL plus 4 mL per indicated liter or 1 in3 plus 1 in3 per indicated gallon

**Condition:** normal and special tests

**Handbook 44 section:** 3.30. Liquid-Measuring Devices

**Edition:** 2026

> * For test drafts ≤ 40 L or 10 gal, the tolerances specified for Accuracy Class 0.5 in the table above do not apply. For these test drafts, the following applies: (a) Maintenance tolerances on normal and special tests shall be 20 mL plus 4 mL per indicated liter or 1 in3 plus 1 in3 per indicated gallon. (b) Acceptance tolerances on normal and special tests shall be one-half the maintenance tolerance values.

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-330>

test_condition: normal and special tests

title: test drafts ≤ 40 L or 10 gal · 0.5 · normal and special tests · 3.30. Liquid-Measuring Devices — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** retail motor fuel and retail Diesel Exhaust Fluid (DEF) dispensers

**Special test tolerance:** not applicable

**Handbook 44 section:** 3.30. Liquid-Measuring Devices

**Edition:** 2026

> Special test tolerances are not applicable to retail motor fuel and retail Diesel Exhaust Fluid (DEF) dispensers.

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-330>

special_test_tolerance: not applicable

title: retail motor fuel and retail Diesel Exhaust Fluid (DEF) dispensers · 3.30. Liquid-Measuring Devices — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** Petroleum products delivered from large capacity (flow rates over 115 L/min or 30 gpm)** devices, including motor-fuel devices

**Accuracy class:** 0.3

**Acceptance tolerance (new or newly repaired device):** 0.15 %

**Maintenance tolerance (device already in service):** 0.3 %

**Special test tolerance:** 0.45 %

**Handbook 44 section:** 3.31. Vehicle-Tank Meters

**Edition:** 2026

> - Petroleum products delivered from large capacity (flow rates over 115 L/min or 30 gpm)** devices, including motor-fuel devices - Heated products (other than asphalt) at 0.3 temperatures greater than 50 °C (122 °F) 0.15 % 0.3 % 0.45 %

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-331>

handbook_section: 3.31. Vehicle-Tank Meters

title: Petroleum products delivered from large capacity (flow rates over 115 L/min or 30 gpm)** devices, including motor-fuel devices · 0.3 · 3.31. Vehicle-Tank Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** Asphalt at temperatures greater than 50 °C

**Accuracy class:** 0.3A

**Acceptance tolerance (new or newly repaired device):** 0.3 %

**Maintenance tolerance (device already in service):** 0.3 %

**Special test tolerance:** 0.5 %

**Handbook 44 section:** 3.31. Vehicle-Tank Meters

**Edition:** 2026

> - Asphalt at temperatures greater than 50 °C 0.3A 0.3 % 0.3 % 0.5 % (122 °F)

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-331>

title: Asphalt at temperatures greater than 50 °C · 0.3A · 3.31. Vehicle-Tank Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** Petroleum products delivered from small capacity (at 4 L/min (1 gpm) through 115 L/min or 30 gpm)** motor-fuel devices

**Accuracy class:** 0.5

**Acceptance tolerance (new or newly repaired device):** 0.3 %

**Maintenance tolerance (device already in service):** 0.5 %

**Special test tolerance:** 0.5 %

**Handbook 44 section:** 3.31. Vehicle-Tank Meters

**Edition:** 2026

> - Petroleum products delivered from small capacity (at 4 L/min (1 gpm) through 115 L/min or 30 gpm)** motor-fuel devices 0.5* 0.3 % 0.5 % 0.5 % - Agri-chemical liquids - All other applications not shown in the table where the typical delivery is ≤ 200 L (50 gal)

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-331>

title: Petroleum products delivered from small capacity (at 4 L/min (1 gpm) through 115 L/min or 30 gpm)** motor-fuel devices · 0.5 · 3.31. Vehicle-Tank Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** Devices designed to deliver less than 4 L (1 gal)

**Accuracy class:** 1.1

**Acceptance tolerance (new or newly repaired device):** 0.75 %

**Maintenance tolerance (device already in service):** 1.0 %

**Special test tolerance:** 1.25 %

**Handbook 44 section:** 3.31. Vehicle-Tank Meters

**Edition:** 2026

> - Petroleum products and other normal liquids from devices with flow rates** less than 4 L/min 1.1 0.75 % 1.0 % 1.25 % (1 gpm) and - Devices designed to deliver less than 4 L (1 gal)

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-331>

title: Devices designed to deliver less than 4 L (1 gal) · 1.1 · 3.31. Vehicle-Tank Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


acceptance_tolerance: 3 in3 and 5.5 in3

application: 5 gal and 10 gal test drafts

body:
**Device or commodity:** 5 gal and 10 gal test drafts

**Accuracy class:** 0.5

**Acceptance tolerance (new or newly repaired device):** 3 in3 and 5.5 in3

**Maintenance tolerance (device already in service):** 6 in3 and 11 in3

**Condition:** normal and special tests

**Handbook 44 section:** 3.31. Vehicle-Tank Meters

**Edition:** 2026

> * For 5 gal and 10 gal test drafts, the tolerances specified for Accuracy Class 0.5 in the table above do not apply. For these test drafts, the maintenance tolerances on normal and special tests for 5 gal and 10 gal test drafts are 6 in3 and 11 in3, respectively. Acceptance tolerances on normal and special tests are 3 in3 and 5.5 in3.

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-331>

maintenance_tolerance: 6 in3 and 11 in3

title: 5 gal and 10 gal test drafts · 0.5 · normal and special tests · 3.31. Vehicle-Tank Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


application: Water

body:
**Device or commodity:** Water

**Accuracy class:** 1.5

**Acceptance tolerance (new or newly repaired device):** 1.5 %

**Maintenance tolerance (device already in service):** 1.5 %

**Special test tolerance:** 1.5 %

**Condition:** Overregistration

**Handbook 44 section:** 3.31. Vehicle-Tank Meters

**Edition:** 2026

> Overregistration 1.5 % 1.5 % 1.5 % 1.5 - Water

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-331>

test_condition: Overregistration

title: Water · 1.5 · Overregistration · 3.31. Vehicle-Tank Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** Water

**Accuracy class:** 1.5

**Acceptance tolerance (new or newly repaired device):** 1.5 %

**Maintenance tolerance (device already in service):** 1.5 %

**Special test tolerance:** 5.0 %

**Condition:** Underregistration

**Handbook 44 section:** 3.31. Vehicle-Tank Meters

**Edition:** 2026

> 1.5 - Water Underregistration 1.5 % 1.5 % 5.0 %

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-331>

test_condition: Underregistration

title: Water · 1.5 · Underregistration · 3.31. Vehicle-Tank Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


application: Anhydrous ammonia, LPG

body:
**Device or commodity:** Anhydrous ammonia, LPG

**Accuracy class:** 1.0

**Acceptance tolerance (new or newly repaired device):** 0.6 %

**Maintenance tolerance (device already in service):** 1.0 %

**Special test tolerance:** 1.0 %

**Handbook 44 section:** 3.32. LPG and Anhydrous Ammonia Liquid-Measuring Devices

**Edition:** 2026

> Anhydrous ammonia, LPG 1.0 0.6 % 1.0 % 1.0 % (including vehicle-mounted meters)

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-332>

title: Anhydrous ammonia, LPG · 1.0 · 3.32. LPG and Anhydrous Ammonia Liquid-Measuring Devices — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


application: Gases at low pressure

body:
**Device or commodity:** Gases at low pressure

**Accuracy class:** 3.0

**Acceptance tolerance (new or newly repaired device):** 1.5 %

**Maintenance tolerance (device already in service):** 1.5 %

**Condition:** Overregistration

**Handbook 44 section:** 3.33. Hydrocarbon Gas Vapor-Measuring Devices

**Edition:** 2026

> Gases at low pressure Overregistration 1.5 % 1.5 % 3.0 (for example, LPG vapor) Underregistration 3.0 % 3.0 %

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-333>

title: Gases at low pressure · 3.0 · Overregistration · 3.33. Hydrocarbon Gas Vapor-Measuring Devices — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** Gases at low pressure

**Accuracy class:** 3.0

**Acceptance tolerance (new or newly repaired device):** 3.0 %

**Maintenance tolerance (device already in service):** 3.0 %

**Condition:** Underregistration

**Handbook 44 section:** 3.33. Hydrocarbon Gas Vapor-Measuring Devices

**Edition:** 2026

> Gases at low pressure Overregistration 1.5 % 1.5 % 3.0 (for example, LPG vapor) Underregistration 3.0 % 3.0 %

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-333>

title: Gases at low pressure · 3.0 · Underregistration · 3.33. Hydrocarbon Gas Vapor-Measuring Devices — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** Cryogenic products; liquefied compressed gases

**Accuracy class:** 2.5

**Acceptance tolerance (new or newly repaired device):** 1.5 %

**Maintenance tolerance (device already in service):** 2.5 %

**Special test tolerance:** 2.5 %

**Handbook 44 section:** 3.34. Cryogenic Liquid-Measuring Devices

**Edition:** 2026

> Cryogenic products; liquefied compressed gases 2.5 1.5 % 2.5 % 2.5 % other than liquid carbon dioxide

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-334>

title: Cryogenic products; liquefied compressed gases · 2.5 · 3.34. Cryogenic Liquid-Measuring Devices — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


application: Large capacity motor-fuel dispensers

body:
**Device or commodity:** Large capacity motor-fuel dispensers

**Accuracy class:** 0.3

**Acceptance tolerance (new or newly repaired device):** 0.2 %

**Maintenance tolerance (device already in service):** 0.3 %

**Special test tolerance:** 0.5 %

**Handbook 44 section:** 3.37. Mass Flow Meters

**Edition:** 2026

> 0.3 - Large capacity motor-fuel dispensers (maximum 0.2 % 0.3 % 0.5 % discharge flow rates greater than 100 L/min or 25 gal/min)

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-337>

handbook_section: 3.37. Mass Flow Meters

title: Large capacity motor-fuel dispensers · 0.3 · 3.37. Mass Flow Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** Asphalt at temperatures greater than 50 °C

**Accuracy class:** 0.3A

**Acceptance tolerance (new or newly repaired device):** 0.3 %

**Maintenance tolerance (device already in service):** 0.3 %

**Special test tolerance:** 0.5 %

**Handbook 44 section:** 3.37. Mass Flow Meters

**Edition:** 2026

> 0.3A - Asphalt at temperatures greater than 50 °C 0.3 % 0.3 % 0.5 % (122 °F)

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-337>

title: Asphalt at temperatures greater than 50 °C · 0.3A · 3.37. Mass Flow Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** Small capacity (retail) motor-fuel dispensers

**Accuracy class:** 0.5

**Acceptance tolerance (new or newly repaired device):** 0.3 %

**Maintenance tolerance (device already in service):** 0.5 %

**Special test tolerance:** 0.5 %

**Handbook 44 section:** 3.37. Mass Flow Meters

**Edition:** 2026

> 0.5 - Small capacity (retail) motor-fuel dispensers 0.3 % 0.5 % 0.5 %

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-337>

title: Small capacity (retail) motor-fuel dispensers · 0.5 · 3.37. Mass Flow Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


application: Anhydrous ammonia

body:
**Device or commodity:** Anhydrous ammonia

**Accuracy class:** 1.0

**Acceptance tolerance (new or newly repaired device):** 0.6 %

**Maintenance tolerance (device already in service):** 1.0 %

**Special test tolerance:** 1.0 %

**Handbook 44 section:** 3.37. Mass Flow Meters

**Edition:** 2026

> 1.0 - Anhydrous ammonia 0.6 % 1.0 % 1.0 % - LP Gas (including vehicle-tank meters)

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-337>

title: Anhydrous ammonia · 1.0 · 3.37. Mass Flow Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


application: LP Gas (including vehicle-tank meters)

body:
**Device or commodity:** LP Gas (including vehicle-tank meters)

**Accuracy class:** 1.0

**Acceptance tolerance (new or newly repaired device):** 0.6 %

**Maintenance tolerance (device already in service):** 1.0 %

**Special test tolerance:** 1.0 %

**Handbook 44 section:** 3.37. Mass Flow Meters

**Edition:** 2026

> 1.0 - Anhydrous ammonia 0.6 % 1.0 % 1.0 % - LP Gas (including vehicle-tank meters)

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-337>

title: LP Gas (including vehicle-tank meters) · 1.0 · 3.37. Mass Flow Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


application: Compressed natural gas as a motor-fuel

body:
**Device or commodity:** Compressed natural gas as a motor-fuel

**Accuracy class:** 2.0

**Acceptance tolerance (new or newly repaired device):** 1.5 %

**Maintenance tolerance (device already in service):** 2.0 %

**Special test tolerance:** 2.0 %

**Handbook 44 section:** 3.37. Mass Flow Meters

**Edition:** 2026

> 2.0 - Compressed natural gas as a motor-fuel 1.5 % 2.0 % 2.0 % - All other hydrocarbon gases and any other hydrocarbon gas/air mix applications not shown in the table

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-337>

title: Compressed natural gas as a motor-fuel · 2.0 · 3.37. Mass Flow Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


application: Cryogenic liquid meters

body:
**Device or commodity:** Cryogenic liquid meters

**Accuracy class:** 2.5

**Acceptance tolerance (new or newly repaired device):** 1.5 %

**Maintenance tolerance (device already in service):** 2.5 %

**Special test tolerance:** 2.5 %

**Handbook 44 section:** 3.37. Mass Flow Meters

**Edition:** 2026

> 2.5 - Cryogenic liquid meters 1.5 % 2.5 % 2.5 % - Liquefied compressed gases other than LP Gas

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-337>

title: Cryogenic liquid meters · 2.5 · 3.37. Mass Flow Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** Liquefied compressed gases other than LP Gas

**Accuracy class:** 2.5

**Acceptance tolerance (new or newly repaired device):** 1.5 %

**Maintenance tolerance (device already in service):** 2.5 %

**Special test tolerance:** 2.5 %

**Handbook 44 section:** 3.37. Mass Flow Meters

**Edition:** 2026

> 2.5 - Cryogenic liquid meters 1.5 % 2.5 % 2.5 % - Liquefied compressed gases other than LP Gas

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-337>

title: Liquefied compressed gases other than LP Gas · 2.5 · 3.37. Mass Flow Meters — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


application: Liquid carbon dioxide

body:
**Device or commodity:** Liquid carbon dioxide

**Accuracy class:** 2.5

**Acceptance tolerance (new or newly repaired device):** 1.5 %

**Maintenance tolerance (device already in service):** 2.5 %

**Special test tolerance:** 2.5 %

**Handbook 44 section:** 3.38. Carbon Dioxide Liquid-Measuring Devices

**Edition:** 2026

> 2.5 Liquid carbon dioxide 1.5 % 2.5 % 2.5 %

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-338>

title: Liquid carbon dioxide · 2.5 · 3.38. Carbon Dioxide Liquid-Measuring Devices — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


application: Hydrogen gas as a vehicle fuel

body:
**Device or commodity:** Hydrogen gas as a vehicle fuel

**Accuracy class:** 7.0

**Acceptance tolerance (new or newly repaired device):** 5.0 %

**Maintenance tolerance (device already in service):** 7.0 %

**Handbook 44 section:** 3.39. Hydrogen Gas-Measuring Devices

**Edition:** 2026

> 7.0 Hydrogen gas as a vehicle fuel 5.0 % 7.0 %

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-339>

handbook_section: 3.39. Hydrogen Gas-Measuring Devices

title: Hydrogen gas as a vehicle fuel · 7.0 · 3.39. Hydrogen Gas-Measuring Devices — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** a DC system that was placed in service prior to January 1, 2025, and that is marked Class 5

**Acceptance tolerance (new or newly repaired device):** 5.0 %

**Maintenance tolerance (device already in service):** 5.0 %

**Condition:** acceptance and maintenance tolerances

**Handbook 44 section:** 3.40. Electric Vehicle Fueling Systems

**Edition:** 2026

> shall be as follows: (a) For a DC system that was placed in service prior to January 1, 2025, and that is marked Class 5, acceptance and maintenance tolerances are: 5.0 %. This paragraph T.2.2.(a) shall expire on January 1, 2034; after that date, all DC EVSEs shall be subject to the tolerances of paragraph T.2.2.(b).

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-340>

handbook_section: 3.40. Electric Vehicle Fueling Systems

test_condition: acceptance and maintenance tolerances

title: a DC system that was placed in service prior to January 1, 2025, and that is marked Class 5 · acceptance and maintenance tolerances · 3.40. Electric Vehicle Fueling Systems — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


body:
**Device or commodity:** any DC system not subject to paragraph T.2.2.(a)

**Acceptance tolerance (new or newly repaired device):** 1.0 %

**Maintenance tolerance (device already in service):** 2.0 %

**Handbook 44 section:** 3.40. Electric Vehicle Fueling Systems

**Edition:** 2026

> (b) For any DC system not subject to paragraph T.2.2.(a), tolerances are: (1) Acceptance Tolerance: 1.0 %; and (2) Maintenance Tolerance: 2.0 %.

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-340>

title: any DC system not subject to paragraph T.2.2.(a) · 3.40. Electric Vehicle Fueling Systems — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)


application: EVSE load tests for AC Systems

body:
**Device or commodity:** EVSE load tests for AC Systems

**Acceptance tolerance (new or newly repaired device):** 1.0 %

**Maintenance tolerance (device already in service):** 2.0 %

**Handbook 44 section:** 3.40. Electric Vehicle Fueling Systems

**Edition:** 2026

> T.2.1. EVSE Accuracy Test Tolerances for AC Systems. – The tolerances for EVSE load tests for AC Systems are: (a) Acceptance Tolerance: 1.0 %; and (b) Maintenance Tolerance: 2.0 %.

Source: <https://www.nist.gov/document/2026-nist-handbook-44-section-340>

title: EVSE load tests for AC Systems · 3.40. Electric Vehicle Fueling Systems — How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)