Circuit Tester: H

21700 The New Circuit Master Automotive Circuit Tester Computer SafeFeatures and Benefits: Will Not Harm On-Board Computers. Circuit Master is the modern universal circuit tester for all vehicles. Use to test all primary electrical circuits plus any on-board computer systems. Test computer circuits without fear of causing damage to expensive electronic components. Completely safe to use on microprocessor control modules. Operating range from 3-15 volts. Current draw is less than 21 milliamps at 12 volts D.C. Long.