Senior Moment

When I first got this unit a couple of weeks ago, I tried to use it with different instruments. It would not work. When I decided to put reading glasses on, I saw that it had a compartment for a 9 volt battery. I have another battery tester that requires no power, so I thought this would function without a power source as well. Once I got it working it was fine. One problem is that to test AA and AAA batteries, it is hard to hold the battery in the correct position and still push in the test button. That only reduces the rating by half a star. It is a useful diagnostic instrument for checking the 9 volt in my Wechter Pathfinder guitar and my Fernandes Retro Rocket with sustainer. Even though I use pedals with a power supply there are times I will be using batteries for those, so it was a great investment