1). ISO9001:2008 2). lithium battery 3). flow range: 6 m3/h,10m3/h,16m3/h,25m3/h,40m3/ ... h,65m3/h,100m3/h Technical features:Nominal Flow 6 m3/hMeasuring Precision B GradeMWP 10KpaWorking life data ≥100yearsDisplay ... gas meter. Please be sure that arrow marks of gas flow direction at the top of watch case and valve should ...