The OBD-2 DLC Health Checker from Automotive Diagnostics and Publishing is a handheld standalone tool. It's its own computer with a graphing voltmeter screen. Key features include a CAN network 120 ohm termination resistor and a CAN network voltage injection. It also offers 12V alternator ripple current, stress test on power and ground (chassis and sensor), and 12V cranking amps analysis with test pass/fail result. The Health Checker automatically tests upon turning on. Users can also perform a single test upon selecting desired test.