The Snap-on Wireless Battery System Tester, No. EECS550, allows technicians the freedom to maneuver around a vehicle with the main module communicating via Bluetooth to the monitoring unit connected directly to the vehicle battery. This capability eliminates the need for a second technician to perform on-screen commands. The menu and test results display on an easy-to-read, back-lit screen in eight languages. Engineered with patented conductance technology, the EECS550 detects discharged batteries down to 1V and tests 6, 8, 12 and 24V systems.