structure, easy to install. Can be widely used to measure, , gasoline, etc. Intuitive clear reading, high reliability, measuring accuracy is 0.5%. High-definition displays show both instantaneous and cumulative flow. Modular design makes it suitable for use with output modules, sensors and remote transmitters. Inside diameter(about):31 mm Connection:thread Battery:2 x AAA Battery(not include) Nominal diameter:6 min /1 inch, 1.5 inch Flow Rate:9L/min-100L/min Measurement accuracy:0.5%, 0.5% Repeatability:0.3%, 0.3% Maximum working pressure:20RAR, 20RAR Single count range:9999.9, 9999.9 Cumulative counting range: 999999, 999999 Suitable for:For crude oil, , gasoline, , etc. Nominal diameter:3/4inch Colour:As Shown Material:plastic+metal size:(about):105 x 66 mm Package Contents: 1 * Flow Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.