The Sentry LiPo/NiMH Digital Voltage Monitor offers you an easy to use DVM with superior battery application over the competition. The Sentry DVM quickly confirm charge levels on conventional Ni-Cd and Ni-MH batteries and it is the only tester on the market that tests popular LiPo packs. The Sentry DVM features a large LCD digital display and a 7-step bar graph for quick assessment of battery charge levels. And, the Sentry DVM is powered by the load battery so no internal batteries are required.