The ZTS Mini Multi-Battery Tester (Mini-MBT9R with 9v NiMH capability) provides a comprehensive means of testing the state of charge or state of power for more than 10 battery types. The Mini-MBT9R's microprocessor-based design makes battery testing simple - 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. There are no settings, and test results are easy to understand. Its small size makes it ideal for the gadget bag, toolbox, or home utility drawer. Tests NiMH and Alkaline. Uses 4AAA batteries (not included) Made in U.S.A. Patents 6,823,274 and D515,444.