3.99The Battery Capacity Tester Volt Checker is a digital device designed to test the voltage and capacity of 9V, 1.5V AA/AAA batteries. With a coin cell diameter range of 6.6-8.5mm, it is suitable for various battery sizes. This mains charger compatible product from China provides accurate readings for AAA and AA batteries, making it a versatile tool for maintaining and monitoring your battery stock levels. Ideal for sound and vision devices, this battery tester ensures efficient power usage and reliable performance.