A self-contained, countertop mounted, electrically heated, steam sterilizer. The unit is controlled by a microcomputer that monitors and controls all unit operations and functions and provides visual indication of cycle stages and deviations. A printer-recorder documents and records each cycle performance. For low volume, convenient, steam sterilization of liquids, media, instruments, glassware, and absorbent materials, in clinics and other areas of the health care facility.