Battery checker,3 LEDs to indicate voltage, to tester almost 1.5V and 9V batteries.also known as battery meter. Battery checker1, 3 LEDs to indicate battery power, to tester almost all 1.5V and 9V batteries;2, With probe, easy to test; 3, Power supply: AG13*3( included ); 4, Unit size: 55*50*26mm. Battery checker