This is a time for darkroom work or anything needing a 60 second mechanical interval light controller/timer.
Normally open circuit, two-prong female outlet on back feeds enlarger lamp circuit or chosen circuit.
Workers perfectly, looks like it's right out of the box.
I believe the stamping on the bottom indicates it was probably made April 17th, 1978. This was about affordable time digital timers first came out.
Makes a buzzing sound until the time runs out. This can be used with sensory equipment to control or limit the length of power duration. Can control vibrations, lights, scents, lazer, just about anything.
Graylab digital timer is in our inventory but not published yet, contact us for price and availability.