Hey Frank. Like I said, a cheap red digital clock with a number of red or ND filters over the screen works great. I've never had a problem with fogging the film from this device. Plus, I don't have to set it. I use some old timers that my dad had in his studio for the actual timing. (They can be rigged with a string so you can pull the arm by waving your hand where the string is.) The clock is for agitation purposes.
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