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