Ultra Micro 1S / UMX 2S Lipo Battery Test Kit Check cell voltages for Eflite / Hobbyzone / Parkzone 1S and 2S Ultra Micro / UMX Batteries 1S-6S Voltmeter shows total pack voltage and individual cell voltages for up to 6 cells, can be used with standard JST-XH balance taps on most batteries 1S to Balance and 2S to Balance adapters allow Ultra Micro / UMX batteries to plug into most battery checkers and some smart chargers 1S-6S Voltmeter is especially designed to work with pack voltages down to 2.7V, allowing 1S lipos to be checked (most cell checkers are not compatible with 1S batteries) Keep your Ultra Micro / UMX lipo batteries in shape, and never fly with a dead battery again!