Small and Portable: Small, simple and effective AA AAA battery tester (BT-168D), compact and lightweight, easy to carry. Test Different Battery Types: The battery tester is suitable for standard household batteries and rechargeable batteries. AA, AAA, C, D, 1.5V, 9V, button cell battery tester. Battery-free Operation: Easy to read, numbers indicate power level. No batteries are required. It is activated by the battery under test.Easy to read: The design of a portable device Easy to read: The battery voltage value is displayed on the LCD screen.Battery saving: You can simply test the battery voltage to see if the battery capacity is low or high, which prevents us from wasting a perfectly good battery by throwing away a good one. Tons of batteries all over the house but can't find a good one to replace? Still not sure which battery to keep and which to throw away? Why waste time inserting and removing battery after battery when you can just test it? This handy battery tester allows you to get the most out of your batteries. Test batteries in seconds, tells you when it's time to buy a new one.The battery tester can be used to test the following battery specifications:1.5V-----AAA, HP6, MN2400, RO3, AA, HP7, MN1500, UM3 C, HP11, MN1400, UM2, D, HP2, MN1300, UM1 and button batteries.9V------PP3, MN1604,6F22,006PNo power supply requiredCan quickly measure the battery voltage, digital display test results, compact and easy to carry, easy to judge whether the battery is good or bad, is a good helper for the family.Identify the quality of the battery:Red = replaceYellow = poor performanceGreen = goodSimply identify the battery condition through the analog display needle.Note:1. You can simply test the battery voltage to see if the battery capacity is low or high. Will not directly and accurately identify the battery capacity accurately. 2. Remember: The battery tester is started by the battery to be tested, and the test time should be as short as possible to avoid unnecessary battery consumption.