Small and portable: Simple and effective small aa aaa battery tester (BT-168D), compact and lightweight, easy to carry.Test different types of batteries: The battery tester is suitable for standard and rechargeable household batteries. AA, AAA, C, D, 1.5V, 9V, button battery tester. Battery-free operation: easy to read, numbers indicate power level. No batteries are needed. It is activated by the tested battery.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 the battery to see if the battery capacity is low or high, which prevents us from wasting a perfect battery by throwing away a good battery. Tons of batteries all over the house but you can't find a good one to replace You still don't know 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 lets you 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, MN1604,6F22,006NO power supply requiredCan quickly measure the voltage of battery, 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 status 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 accurately2. Remember: the battery tester is started by the battery to be tested and the test duration should be as short as possible to avoid unnecessary battery consumption.