Certificate pursuant to section 12 of the Weights and Measures Act 1985 ... the Secretary of State for Trade and Industry hereby certifies as suitable for use for trade the following pattern of a liquid flowmeter : submitted by Essence Systems International Ltd.
Great Britain.Department of Trade and Industry.
National Weights and Measures Laboratory.
Essence Systems International Ltd.
Teddington : National Weights and Measures Laboratory,
1990.
Reference no. STD 6022
Flow meters