In-service testing handbook for gas and electricity meters

Guide to the methodology, overview of timescales and testing requirements for in-service testing (IST).



The in-service testing (IST) handbook is a culmination of the IST group 1 and 2 and the IST group 3 report. It is designed to provide stakeholders who are undertaking sample testing with an understanding of the sampling methodology, test processes, assessment methods and final assessment criteria. The handbook includes details of IST test stations that have been approved by the National Measurement and Regulation Office (NMRO) for the in-service testing of gas and electricity meters.

The handbook is a working document and amendments can be made when necessary as the implementation of IST develops over time.


If you wish to speak to a member of staff please contact:

Gas and electricity metering team: In-service testing

Utilities Business Team
National Measurement Office
Stanton Avenue

TW11 0JZ