The Time-O-Lite GR90 Darkroom Timer incorporates an accurate synchronous motor coupled with an automatic reset mechanism.
A toggle switch controls power to the enlarger permitting either timed or constant output (for focusing). The timer incorporates a maximum 60 second cycle, has a luminous dial, chemically resistant Lexan case, and can be either wall or table mounted.
A polarized 2-wire grounded plug and recepticle as well as a 750 load capacity make this enlarger time appropriate for school or enthusiast darkroom use.