Masterflex^™ pump drive 

Does not include pump head.
Economy: unidirectional, lowest priced variable-speed drive, ± 5% speed uniformity. Accepts one EASY-LOAD head.
Precision: bidirectional, soft start, 10-turn speed control, ± 1% speed uniformity. Accepts DB9 cable for remote control capabilities.
Digital: bidirectional, high-precision digital speed control, ± 0.25% speed uniformity. Displays rpm, flow rate, and % speed. Accepts DB9 cable for remote control capabilities.

MasterFlex is a trademark of Cole-Parmer Instrument Co.