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The Laser circuit tester from Laser Tools is versatile, useful and suitable for 6, 12 and 24Volt automotive systems. More than a standard circuit tester, it features a clear and easy to read digital display which reads from 5 to 28Volts with an accuracy of plus or minus 3%, and bright LEDs to indicate power (red) or ground (green). This tester is robustly manufactured and come with a 3m coiled cable for added versatility when working. Do not use on air bags.