I purchased one of these a few weeks ago and have found it extremely useful/reassuring and thought I would share for the fellow forgetful. I have tumbled brass for longer than I care to admit multiple times, once (very recently) I left the heater on my Lubrasizer on and discovered a mass of carnuba red encompassing the sizing die, and I’m always worried about leaving the lead pot running.
This device is easy to use and gives me a little bit more insurance to make sure that I don’t get in the way and do something unfortunate. Costs 11.99 on Amazon and is a Century Smart Digital Countdown. They also have many other makes/models. This particular one was cheap enough for me and fit the bill. Just plug in your device and press the duration length. Works great.
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Maybe I should just invest in some Ginko Biloba...
Anyway hope this helps,
Kev