The ZTS Multi-Battery Tester™ (MBT-1) provides a comprehensive means of testing the state of charge or state of power for more than 40 battery types. This microprocessor-controlled instrument is designed to test popular primary (non-rechargeable) and rechargeable batteries using a patented, high accuracy . 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. Uses 4AA batteries (not included) Made in U.S.A. Patents 6,823,274 and D569285.