S & G Tool Aid computer safe automotive logic probe has a high impedance and the current draw is less than 7 milliamps to protect all vehicle circuits including computerized engine, body controls, sensitive electronic sensor, microprocessors, electronic ignition components and air bags. The dual color LED indicates red for power (high) and green for ground (low). Insulated probe has an exposed length of 3 3/8", 6 feet of heavy duty 18 gauge dual leads with large battery clips for easy hook-up and Protect-A-Terminal probe adapter to prevent damage to electrical connectors.