Masterflex® L/S® Series Peristaltic Pumps Accurate and reliable pumps featuring easy-to-use connectivity and control. FLOW RANGE: 0.00005 to 3400 mL/min. 1 of 1. Masterflex L/S series peristaltic pumps include fixed and variable speeds, providing high accuracy drives for precise flow control and dispensing.Oct 1, 2015