flow meter
1 Better than 1% accuracy
2 Positive/negative/net flow totaliser.
3 flowmeter/ex-proof ultrasonic flow meter

flow meter 

TDS-100H handheld ultrasonic flow meter is a battery-powered ultrasonic flow meter with the capability of a full-size flow meter. It is carefully designed for portability and ease of use.

Linearity:0.5%

Repeatability:0.2%

Accuracy:±1% of reading at rates>0.2 mps

Response Time:0-999 seconds, user-configurable

Velocity:±32 m/s

Pipe Size:20mm-6000mm

Liquid Types:Virtually all liquids

Power Supply:3 AAA Ni-H built-in batteries.

Case Size:100x66x20mm

 Handset Weight:514g (1.2 lbs) with batteries