# 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)

For Gases at low pressure · 3.0 · Underregistration · 3.33. Hydrocarbon Gas Vapor-Measuring Devices, device or commodity is Gases at low pressure; accuracy class is 3.0; acceptance tolerance (new or newly repaired device) is 3.0 %; maintenance tolerance (device already in service) is 3.0 %; condition is Underregistration, verified against its source on 2026-08-20.

- **Device or commodity:** Gases at low pressure _(verified: appears in the quote below)_
- **Accuracy class:** 3.0 _(verified: appears in the quote below)_
- **Acceptance tolerance (new or newly repaired device):** 3.0 % _(verified: appears in the quote below)_
- **Maintenance tolerance (device already in service):** 3.0 % _(verified: appears in the quote below)_
- **Condition:** Underregistration _(verified: appears in the quote below)_
- **Handbook 44 section:** 3.33. Hydrocarbon Gas Vapor-Measuring Devices _(verified: appears in the quote below)_
- **Edition:** 2026 _(verified: appears in the quote below)_

## What the source says

> 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

Last verified: 2026-08-20. Review by: 2027-08-20.
Part of [How far off a US fuel pump, LPG meter or EV charger is allowed to be (NIST Handbook 44)](https://referencesource.org/motor-fuel-dispenser-measurement-tolerances-nist/).