* Easy to use - no switches or settings* Quickly and easily identify weak or failing batteries* Patented high accuracy Pulse Load Test* Ideal for battery management and cell matching* Made in U.S.A.The ZTS Multi-Battery Tester (MBT-1) provides a comprehensive means of testing the state of charge or state of power for more than 30 battery types. This microprocessor-controlled instrument is designed to test popular primary (non-rechargeable) and rechargeable batteries using a patented, high accuracy pulse load test. After a fully automatic test cycle, percentage of remaining battery capacity is indicated on the LED bar display. Battery types are clearly labeled next to appropriate contacts. Negative test lead/probe conveniently stores in seam at side. There are no switches or settings, and test results are easy to understand. Test NiMH, Li-Ion, alkaline, lithium, coin cell, button type and more: 3.6v Li-Ion rechargeable [RCR123A, 18500, 17650, 18650]; 1.5v button cell [S76, A76, A625, A640, LR44, 357, 303]; 1.2v NiMH/NiCd rechargeable [AA, AAA, C, D]; 1.5v lithium [AA L91, AAA L92]; 3v lithium coin [CR1216, CR1220, CR1232, CR1612, CR1616, CR1620, CR1632, CR2016, CR2025, CR2320, CR2032, CR2430, CR2450, 58L, 1/3N]; 6v '28' series [28A, S28, 28L, 544, 4LR44]; 3v lithium cylindrical [CR123, CR2]; 1.5v alkaline [AA, AAA, C, D, N]; 12v alkaline [A23]; 9v alkaline & carbon zinc. Uses 4AA batteries (not included).