It works??? Accuracy??
I’ve tried it on several of my mechanical watches and it consistently gives me readings +/- 30 sec/day. It will jump all over from +/- 0.2 to 30 sec/day, sometimes up to 3 min/day, so it’s difficult to get an accurate measurement but it does give you a reading. It’s cool to watch and worth the $5 if your into watches but, I think comparing the stop watch on your cell phone to the second hand on your watch will give you more reliable data.
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