Welcome to the store! This universal mini battery tester maximizes your battery usage by testing for discharged batteries and reducing unnecessary waste. High Compatibility Test Range: Can be used to test D, C, AA, AAA, N, 1.5V button batteries, and 9V batteries. LCD Display: Easy-to-use analyzer displays information about your batteries' health, accurately indicating if the battery is in a bad, weak, or good voltage state. No battery power required for operation, working temperature: 0C ~ 40C. Suitable for carbon, zinc, alkaline, and rechargeable batteries. Color Code: Green means good, yellow means low, and red means bad. It accurately shows if the battery is in a bad, weak, or good voltage state. Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!