For accurate and consistent results, choose a fixed-volume pipettor. Ideal for repetitive delivery of reagents and solutions, these durable lightweight pipettors feature a precision-machined plunger and barrel assembly. The internal polyurethane multi-ring seals prevent fluid leakage far superior to single O-ring pipettors. Pipettors are color-coded to help you keep track of the proper dispensing volume — an excellent choice for a busy lab!