Miraclekoo Bt0505 Battery Tester for AA AAA 9v Battery and Button Battery with 2 D Size Battery Spacer With 1 battery tester and 2 d size battery spacer, battery not included 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