Review on Dlyfull LCD Battery Tester - Universal Checker For AA AAA C D 9V CR2032 CR123A & More, 2X AAA Batteries Included by Dennis Brinson

I’ve owned this product for 8 months. I was a little surprised to see that it operated on a battery. Kind of contradicts the whole thing. If the battery in the tester isn’t good, then the results would be impacted. I loved grabbing this tester and seeing that all of my batteries appeared to be great. But when I used the tester that doesn’t rely on a battery, I would get a different reading.A few times, I placed a battery into this tester, and it said great charge. I put in into the other, it said low. I put it right back into the Dylfull tester, now it indicated low. I did this a few times. This is so backwards. If I wouldn’t have never put it into the other tester, Dylfull would still read great charge.