Handhold ultrasonic flow meter,low price and easy to use and handle. ... light-weight(500g) Wide range, Velocities( 0.01 ~ +/- 32 m/s) Ni-MH Battery support at least 10 hours continuous ... : 50 mm ~ 1000 mm (2" ~ 40")0.0001 m/sPipe Material:Ambient Temperature:Cast Iron, Stainless Steel, Ductile Iron ... +/- 1% ~ +/- 2% value of reading(0.5 ~ 30 m/s)Dimension:+/-0.5% value of reading (online calibration)210 ...