Reproducibility - pumping and dosing. Hei-Flow Ultimate pump includes premium safety standards and features for superior ease of use and reduced cost of ownership, including:r- Flow characterisitc of pump heads in combination with various tubing diameters is pre-programmed for accurate flow rate numbersr- Digital read-out of: Speed (rpm), tubing diameter, flow rate in ml/min, dosing volume, interval dosing and pause functionr- Easily change all process parameters via these buttonsr- It connects to an optional foot-pedal remote control via cable to start and stop your pump drive outside a closed fume hood increasing your personal safety or easy use in multiple sample fillsr- This models feature electronic speed control and an accuracy of ± 0.5%r- A press of the max button accelerates the filling and draining of your tuber- At the press of a button the pump operates clockwise or counter-clockwiser- Calibrate your flow volume and flow rate individuallyr- Control speed (rpm), direction and On/Off function via analog interface for 0 - 10 V or 4 - 20mA or digital RS 232 interfacerSupplied without pump heads. Please order separately.r- Power supply: 230 V.