Usage Tips:Features: 3 types to select, choose different type according to your needs. Stable performances, large flow, high precisions and fast response. Made from quality material, leakproof, wear resistant, high sensitivity. The product is mainly used for testing oil, the cover is made from aluminum alloy material. Good pressure resistance, can bear pressure up to 30kg. Specifications: Interface: DN8 / DN10 / DN15 Voltage: DC3.5-24V Inner Diameter: 11.75mm/16.3mm/19.1mm Thread Length: 12.4mm/12.5mm/10.27mm Flow Range: 30-300L/H±1% or 40-800L/H±1% or 50-1200L/H±1%(Liquid is Water) Water Pressure Resistance: ≤1.0MPA Pulse Frequency: Hz=[1.5xQ]±1% / Hz=[2.3xQ]±1% / Hz=[2.4xQ]±1% High Level Output Pulse: Large Than DC4.5V(Input DC5V) Output Pulse Duty Ratio: 50±10% Working Current: 15mA(DC5V) Colour: Random colors, no specified colors accepted Material: Aluminum alloy + pps Package Contents: 1 x Fluidmeter 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.