Multi-level fixed battery card slot for battery measurement of various specifications.FEATURES-HIGH COMPATIBILITY It is not only suitable for AA, AAA, C, CR123A, D, 9V, N, CR2, CRV3, 2CR5, CR-P2 cylindrical battery testing, but also good for checking a wide variety of button cell batteries.-CRISP LCD SCREEN Easy-to-use analyzer shows what you need to know about your batterys health, it will accurately show whether the battery is in poor, weak, or good condition of voltage.-QUICK RESULTS Simply place a battery into the decent battery detector, it will show you quickly the status of your batteries health by using bars, helps you avoid battery damage from unnecessary recharges. Suitable for carbon, zinc, alkaline and rechargeable batteries.-REMARKABLY COMPACT One of the smallest and lightest portable battery checker. A pocket-friendly compact chassis with an anti-slip finish enables a firm grip in your hand for battery checking.