TOOGOO(R) Compact Easy-to-Use Battery Charge Tester Stop wasting money discarding perfectly good batteries; diagnose battery or appliance fault Compact and super-simple to use - tests multiple sizes: A/AA/AAA, C, D, 9V and button cell batteries Instantly indicates battery charge for good, low or replace Battery-free/maintenance free - uses power of tested battery Tests batteries for flashlights, clocks, calculators, watches, hearing aid, toys & electronics