SpritesMods has a full-length, 5-part write-up that demos how to add wireless connectivity to a Fluke 15B+ digital multimeter – a fairly common device whose mod could be ported to other meters with careful consideration. All the code can be cloned via this git, and chime in on the original thread if you do anything interesting with this mod.
All in all, I feel like I have succesfully diversified my multimeter assortment. I have a Fluke 17B I can use for daily work so I can enjoy quick continuity testing and non-irritating power-off features, and I have the 15B+ as a very capable second multimeter, with WiFi connectivity to show trends and to allow for any device with a browser to act as a remote display. It’s a shame I couldn’t figure out more of the way the main multimeter chip works to get direct access to the display, but the PWM-trick I did to show the IP-address is an alternative that is workable. Here’s a demonstration. As you can see, the multimeter has the IP of 192.168.5.117, and that’s what I enter into the browser.
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