The Electronic Dispensing Operating System (EDOS) provides versatility and accuracy when dispensing a large number of samples. It offers the following functions: single and multichannel pipetting, repetitive dispensing of single or multiple volumes, titrating, diluting, sample mixing, and manual mode. The EDOS unit features automatic recognition of Combitip* Plus tips and pipetting adapters. It has eight adjustable aspiration and dispensing speeds, and can be calibrated for use with liquids of varying viscosities. Up to 12 different volumes can be programmed to be delivered with a storage capability for up to 30 working routines per mode. Optional programming package provides automatic control of the EDOS unit via personal computer. For 115V, 50/60Hz operation.