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From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: ELECTRO-CHEMICAL ELAPSED TIME INDICATORS
Date: Sat, 14 Dec 2024 12:38:46 -0700
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On 12/14/2024 12:29 PM, Joe Gwinn wrote:
> Curtis coulometers are analog Elapsed Time Indicators (ETIs) which use
> an electro-chemical plating process to integrate current over time.

Yes, the ones that I have look like a tiny (very small OD, very short length)
old-fashioned (Hg) thermometer.

I was originally going to install them in some cassette decks (to track
run time) but couldn't decide if I wanted to track power-on-hours,
playback hours, etc.