Aneng socket tester: curiosity teardown

I recent got an inexpensive power socket tester, and as is often the case, I wanted to see what makes it work, so it's teardown time again! ANENG AC27/AC28 Digital Socket Power Tester 50Hz/60Hz Socket Polarity Detector Voltage Tester Circuit Breaker Finder EU/US Plug https://pileofstuff.ca/r/dscp6 ----- My tip jar:   / pileofstuff   My other tip jar (channel membership) :    / @pileofstuff   Buy me a coffee (or a beer): https://ko-fi.com/pileofstuff If you are OK with me getting a commission on your purchases, feel free to use my affiliate links: Ebay: https://ebay.to/33IF7PA Banggood: http://pileofstuff.ca/r/9ajsf Some other links to products may be affiliate links #ElectronicsCreators ----- This isn't the only way to do it. It's probably not the best way to do it. But it's how I did it.