I've used exclusively the 300 analog timer since about 1989 (which is decades older and acquired from a photographer's widow). Simple and iconic. For timing film developing, enlarger, alt proecss exposure, etc...
I have gotten with the times and moved ahead a couple decades or so. The 451 is my new favorite. It is available with membrane buttons that should be water/chemical resistant. It's easy to set and repeat, plenty of options. Monster start button, different brightnesses. Worth the <$100 used.
Makes a nice controller for my UV exposure box. Got another one for the enlarger. Will keep the 300 around for developing sheet film in the dark.
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