This Gra-Lab Model 300 Darkroom Timer is an old standard that's hard
to beat for good design and simplicity of operation. Move the
minute-hand to the desired time, and a buzzer sounds at the exact time
it's supposed to. You can adjust the loudness of the buzzer to your
taste or distance from the timer. It has grounded sockets for an
enlarger and safelight, and of course, the plug and cord are grounded
and sealed for safety.
Though this timer is made for a darkroom, you could also use it for
other equipment or appliances. Alton Brown of "Good Eats" uses one in
his kitchen because it's better than a wimpy little kitchen timer, and
easier to see across the room. If you use it in the dark, the hands
and face will glow in the dark if exposed to light beforehand. (I
flash mine with a strobe a couple of times before darkening the room.)
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