Review on Astro 7764 Digital ⚡ Wide Range Circuit Tester LCD 3-48V by Dante Obong

This is one of the products where designers have ever used a test lamp. Half of my diagnostic work involves connecting a clamp to the positive source and using a probe to the negative. Sometimes you're looking for a good ground, sometimes you'll have a + and - wire and it doesn't matter which one is used to test the voltage. This device will NOT work if the clamp is connected to positive. So for you with a positive or floating bottom, this won't work at all. It does not light up or display anything on the LCD. While the LCD glows fairly well (albeit a poor viewing angle as other reviews have noted) (tested at +13.7V), the "bright" part of the test light is fairly dim. And it's not visible at all from the back of the probe body. It's bad enough that I have to buy something new to use as my main test light and throw that in the back of the box as a backup. Astro Tools - you screwed it up. :(