Peristaltic pump CM1000/YZ1515X Flow range is 0.007~380ml/min/channel. Flow speeds can be adjusted either by hand through switching knobs, instead of the traditional way of membrane keypad, which reduces obviously the failure rate, or by automatic control through the external controller interface, with three available modes: 0-5V, 0-10V and 4-20mA. Memory function is also available in the product in case of power off. Besides, switching knobs are designed clearly so that it is easy to operate for customers. FULL SPEED button available for filling in & emptying out. Good capability price rate. Not suitable when used in the open air.