Abstract: A modular peristaltic pump assembly that will automatically draw, weigh and mix various expensive liquids arranged in bottles contains multiple pumping units or modules driven by a two-part peristaltic pump, the first part being a pump body intended to receive a squeezable hose and the second part being a rotor driven by a motor integral with a mobile unit to which is also joined a recipient device holding a recipient bottle intended to receive liquids drawn off successfully. Each pumping unit is open on its top to receive the rotor. The recipient device incorporates a weighing device making it possible to control the quantity of liquid introduced into the recipient bottle.