Small dosing pumps feature a priming function, no valves or seals, convenient tube replacement, and easy maintenance. Supports positive and negative operation: swapping the positive and negative supplies allows reversal of the pump head. Commonly used in experimentation, biochemical analysis, pharmaceuticals, fine chemistry, and biotechnology. Motor offers efficient performance with stable output and reduced operating noise. Features a screw-free clasp design for convenient disassembly and assembly. Stainless steel screws provide rust and corrosion resistance. Pump head is designed for easy disassembly, cleaning, and maintenance. Type: B Applicable: Direct current 12V Working environment: 0–40°C Relative humidity: Less than 80% Pump tube (inner x outer diameter): 3 x 5mm Flow range: Type B: 25–70 ml/min Speed range: 0.1–60 rpm Current: Type B: 250–300 mA Motor size: 32 x 23 mm / 1.3 x 0.9 inch Center distance of installation hole: 48.5 mm / 1.9 inch Color: Black Material: Plastic + Metal Package Contents: 1 x Peristaltic Pump Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item to appear slightly different from the real thing. Measurement allows an error of +/- 1–3 cm.