# 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)

For Water · 1.5 · Underregistration · 3.31. Vehicle-Tank Meters, device or commodity is Water; accuracy class is 1.5; acceptance tolerance (new or newly repaired device) is 1.5 %; maintenance tolerance (device already in service) is 1.5 %; special test tolerance is 5.0 %, verified against its source on 2026-08-20.

- **Device or commodity:** Water _(verified: appears in the quote below)_
- **Accuracy class:** 1.5 _(verified: appears in the quote below)_
- **Acceptance tolerance (new or newly repaired device):** 1.5 % _(verified: appears in the quote below)_
- **Maintenance tolerance (device already in service):** 1.5 % _(verified: appears in the quote below)_
- **Special test tolerance:** 5.0 % _(verified: appears in the quote below)_
- **Condition:** Underregistration _(verified: appears in the quote below)_
- **Handbook 44 section:** 3.31. Vehicle-Tank Meters _(verified: appears in the quote below)_
- **Edition:** 2026 _(verified: appears in the quote below)_

## What the source says

> 1.5 - Water Underregistration 1.5 % 1.5 % 5.0 %

## Source

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

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/).