Smart battery tester for checking your batteries. 

If an EVOtagger doesn't show up on the list of taggers when you press the trigger, and you can't remember the battery status from the last time you used it, then this battery tester is very handy. 

Remove the 9V battery from the EVOtagger and read how high the voltage is. If the voltage is below 7.2V, the battery must be replaced, as the Bluetooth connection will become unstable.

In addition to 9V batteries, it can also test:
Micro (AAA)
Mignon (AA)
Baby (C)
Mono (D)
Lady (N)

Dimensions: 77.5 x 34 x 14.3 mm

Note: This tester uses 1xAAA battery, which is not included in the package.