The OmniPetteª series of multi-channel pipettes by ASI is a culmination of decades of liquid handling research. Every aspect of accuracy, reliability, and user comfort has been carefully reviewed in designing these high precision pipettes. The result is an advanced pipette that exhibits superior accuracy & ergonomics and is comfortable to use, even during prolonged and repetitive pipetting. The OmniPetteª series features a continuously adjustable, digital micrometer for volume selection and a non-mandatory locking wheel (positioned at the top of the handle for simple one-handed activation/deactivation). The finely polished stainless piston and chemically resistant, maintenance-free seals provide unsurpassed accuracy. The air-jacketed handle protects the micrometer mechanism from the inaccuracies that can be caused by thermal expansion. This enhances continued pipetting precision even after prolonged use. 4 models are available for maximum precision at virtually every conceivable volume. However, only four models are needed to cover the standard range from 2uL to 300uL. State of the art technologies and materials have been designed into the OmniPette's construction, making it an exceptionally light weight, well balanced instrument. The ergonomically shaped tip ejector button is designed and contoured to minimize pressure on the thumb. Actuation forces and spring pressures of ASI's adjustable pipettes have been significantly reduced.