WATER SAMPLER The Masterflex® E/ S™ portable sampler, part of our environmental sampling series from Masterflex® , is designed for the ultimate in portability and versatility. Run up to four hours on the self-contained 12 VDC rechargeable battery, or indefinitely from any AC or 12 VDC power supply. Charge the internal battery from an AC power supply or a DC voltage source of lower voltaic potential than the battery itself. The variable-speed drive has a top speed of 400 rpm, allowing you to adjust the flow rate to the needs of your application. Pump is encased in a high-visibility yellow housing for easy recognition and recovery in the field. Unit measures 16 " H x 11-1/ 3 " W x 10-1/ 2 " D. Features:  Economical choice for basic sampling applications Features a single-turn potentiometer for speed control, ON indicator, and three-position power/ reversing switch Reversible flow and prime/ purge function Uses Masterflex® L/ S® standard, Quick Load® , PTFE tubing, or Easy-Load® pump heads Floats up to 30 minutes if dropped in water when case is closed and latched!  IP54-rated control panel protects against inclement weather and splashing water Rechargeable battery— ideal for field applications Specifications:  Motor Type: Variable with speed controlled by a single-turn potentiometer. Speed Range: 1 to 400 rpm. Number of Standard Heads Accepted: one. Reversible Flow: Yes. Power AC/ Hz: 115V/ 60. Dimensions: 10-1/ 2” D x 11-1/ 3” W x 16” H. Includes:  Instruction manual AC adapter with 12-ft cable