This Wheaton Omnispense PLUS 375020-A Peristaltic Pump Dispenser is in used condition, has been tested and is guaranteed to be fully functional. This pump came from a local lab that had surplus lightly used equipment. We urge customers to view all photos as they show overall condition, included accessories and functionality. Please feel free to contact us with any questions. Wheaton W375020-A Omnispense PLUS Peristaltic Pump Liquid Dispenser with Digital Display, Microprocessor Controlled, 120VAC Fully programmable pump delivers a preset volume with a constant flow-rate over a specific period of time. Accurately dispenses low and high viscosity liquids within lt;=1% accuracy. Accepts multiple tubing sizes and up to three pumpheads for multiple dosing. Reverse-flow option for various dispensing and aspirating operations. Full microprocessor controls, including programmable soft start, one step volume calibration and self-prompting LCD readout.