If "timing is everything", then surely you can be "sure" if you are relying on
the Graylab Model 451, which has a range from 1 to 99 minutes.
Not only is this timer widely used in darkrooms of all types, it is also used
for applications in industrial and time-lapse photography, animal feeding and
stimulus, water analysis, centrifuges, solenoid switching, just to name a few.
The Model 451 has two separately programmable memories and is a combination
switching timer/ intervalometer featuring inductive load and logic level output
capabilities. It offers simple operations and an adjustable, highly visible,
2-digit LED display. It has easily adjustable membrane controls for display
brightness, two countdown time ranges - seconds to 99 and tenths of seconds to
9.9, three audio signal choices - off, metronome and end-of-cycle tone, and AC
outlet power "on" or timer controlled operation selection.
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