My old boss in Tampa swore by them for checking motor bearings under load. You'd catch a failing pump bearing at 140 degrees before it ever made a weird sound. Saved a ton of downtime. That's the real win, like @dixon.daniel said, finding the hidden stuff. It's not just for electrical. I even scanned a kitchen wall once, found a hot water pipe leak inside the drywall before it burst.

Yeah, I mean it feels like there's all this overly careful advice floating around for simple stuff. Like people say you should only quit a job with a formal letter, but then you just end up having the real talk with your boss in person anyway. Or the whole 'never discuss salary with coworkers' rule that just makes everyone guess. It turns normal talks into this weird game with too many rules. Maybe it's just me but I'd rather deal with the slight awkwardness of a real conversation than have weeks of weird vibes over an email.

Use a hair dryer to soften the old paint. Run it along the seam for a minute or two, then try to work the window loose with your hands. The heat makes the paint gummy so it lets go without you having to force it and risk cracking the glass.

Totally get what you mean about the barcode not teaching you how to see. I felt the same way for the longest time. What changed for me was realizing the scanner just gives a number, but you still have to learn what that number means in your hand. It became a starting point, not the whole lesson. Now I use the grade it gives to check my own guess, which actually helped me learn faster.

Yeah @jamie_brown49, but a bike factory's footprint is tiny next to making and fueling a car. The average car emits about 4.6 tons of CO2 a year just from driving. Bike parts might have some impact, but it's a fraction of that. It's about picking the less bad option, not a perfect one.