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What Happened To Duracell PowerCheck?
(hackaday.com)
This is a most excellent place for technology news and articles.
I have a really distinct memory of finding a bunch of these in a friend’s house when I was a kid and every one was empty. After watching the TC video I think it’s more likely I just wasn’t pressing hard enough and had no way to know that. Anyway, I can see why they stopped making them.
Yea, you have to press till it hurts, lol
I ended up buying a couple testers from Walmart for like $5 and they've been super useful! Definitely worth having in every household