# 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)

For Small capacity (retail) motor-fuel dispensers · 0.5 · 3.37. Mass Flow Meters, device or commodity is Small capacity (retail) motor-fuel dispensers; accuracy class is 0.5; acceptance tolerance (new or newly repaired device) is 0.3 %; maintenance tolerance (device already in service) is 0.5 %; special test tolerance is 0.5 %, verified against its source on 2026-08-20.

- **Device or commodity:** Small capacity (retail) motor-fuel dispensers _(verified: appears in the quote below)_
- **Accuracy class:** 0.5 _(verified: appears in the quote below)_
- **Acceptance tolerance (new or newly repaired device):** 0.3 % _(verified: appears in the quote below)_
- **Maintenance tolerance (device already in service):** 0.5 % _(verified: appears in the quote below)_
- **Special test tolerance:** 0.5 % _(verified: appears in the quote below)_
- **Handbook 44 section:** 3.37. Mass Flow Meters _(verified: appears in the quote below)_
- **Edition:** 2026 _(verified: appears in the quote below)_

## What the source says

> 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

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/).