Small dosing pumps have self-priming function, no valves or seals, convenient tube replacement, easy maintenance.Positive and negative support: swap the positive and negative power supplies, can reverse the pump-head.The dosing pump is generally used in the fields of experimentation, biochemical analysis, pharmaceuticals, fine chemistry, biotechnology.Motor efficient with a stable performance in output, reduced operation noise, used the clasp without screw for convenient disassembly and assembly.Stainless steel screws, rust corrosion resistance. The pump-head designed for easy disassembly, easy to wash and maintain.Type: BApplicable power: direct current 12 voltageWorking environment: 0-40Relative humidity: Less than 80%Pump tube(inner x outer diameter): 3 x 5mmFlow-range:type B: 25-70ml/minSpeed range: 0.1-60rpmCurrent:type B: 250-300mAMotor size: 32 x 23mm / 1.3 x 0.9inchCenter distance of installation hole: 48.5mm / 1.9inchcolor:BlackMaterial:plastic+metalPackage Contents:1 x Peristaltic PumpOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.