infrared thermometer - curiosity teardown and minor repair

This non-contact infrared thermometer has been bouncing around in my toolbox for a few years and needs a bit of attention. I've always been curious about what makes this thing tick, so while I've go tit apart, let's take a look at what is in there. Here's the sales listing (which has a link to the manual) if you are interested. https://www.princessauto.com/en/detai... ----- My tip jar:   / pileofstuff   If you are OK with me getting a commission on your e-bay purchases, feel free to use my affiliate link: https://ebay.to/2kxTvss ----- This isn't the only way to do it. It's probably not the best way to do it. But it's how I do it.