Gardner Bender Digital Battery Tester for AA, AAA, C, D, N, 9-Volt, 1.5-Volt Button Cells GBT-2502 - The Home Depot
How to Test 9V Battery Cell Using Multimeter & Measure Voltage - YouTube
Amazon.com: D-FantiX Battery Tester, Universal Battery Checker Small Battery Testers for AAA AA C D 9V 1.5V Button Cell Household Batteries Model BT-168 : Electronics