Features: Brand New Correction rollers take adjustment action to facilitate the user to replace the tube avoid clipping and breaking the tube due to lack of experience Ball bearings in the wheel frame, silent, long life time Stainless steel screws, rust corrosion resistance Set the card slot to prevent deviation correction, pump damage Specifications: Motor: 12V/24V DC motor DC motor current: 0.5-1.4A Working environment: 0-40, relative humidity, 80% Medium flow: the flow direction of this pump depends on the positive and negative connections Flow range: 0 - 400ml/min Tube: inner diameterxouter diameter (6.4mmx9.6mm) wall thickness: 1.6mm, the maximum diameter: 9.6mm Tube material: transparent silicone tube Roller type: ball bearing Pump cover: hand twist screws, quick disassemble convenient tube replacement Can be equipped with constant speed DC deceleration motor, stepper motor (adjustable speed)and synchronous motor, long motor life and low noise stepper motor Shell material: PC Rolling wheel: POM Quantity: 1 Set Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! No Retail Package Package Includes: 1 x Large Flow Peristaltic Pump 1 x Wrench