The SHONSIN Absolute Scale Digital Caliper has an easy to read LCD display and is as accurate as my famous $300+ digital calipers. It turns on automatically when the jaws are moved and either turns off automatically or can be turned off manually. When I remove the caliper, I leave the jaws slightly open and then turn the set screw so a hit to the housing doesn't turn it on and drain the battery. Incidentally, the battery is a completely normal one. Round Round Round Round Round Round Round Round Round Flat Round Flat Round Flat Round Round Round Round Round Round Round Round Round Round Round Round Round Grid type CR2032 (lithium). All in all I am 100% satisfied. Both thumps up!