Let me say that this is a very useful device to have in your shop or in the field. The accuracy was checked with my Fluke RMS meter and found to be within tolerance. So this device can check batteries, but can also balance packs (slowly) and power or your USB devices.
The only con is; the screen protector is a pain in the butt to put on the device. The problem is the LCD screen is plastic and so is the screen protector. Static electricity causes same dust or particles to stick between the surfaces during the application process. I would have preferred the factory to install these or upgrade the screen material all together. Considering the price, this did not cause me to drop the start rating
This is a awesome tool to have and very satisfied with the performance. I think ISDT is a company to be watching for future products
RichJ53