Review on 🔋 Advanced Self-powered Battery Tester: Sinometer BT558 by Faten Teller

I've bought several inexpensive review units recently, each with its own pros and cons. The one I liked best, which gave a digital readout of the current battery voltage, didn't have 45-degree battery guides - the one that did had an analog reader. My wife prefers this style which we found earlier at Radio Shack. It's not perfect, but she loves it, so we have that and three other testers. If only a digital voltage tester had slanted sides for AA and AAA batteries.