Overview Reviews Product Description Operating range of 3-49 volts DC to work on most vehicle electrical systems. Two LEDs provide 360° visibility of polarity. The red light indicates positive polarity, green indicates negative polarity. Long, 12ft. coil cord and heavy-duty alligator clamp for secure connections. The probe is insulated to prevent the possibility of shorting the side of the probe to other components. Computer safe. Will not damage sensitive electronic components. Not for use on airbags. Lisle Tools Catalog Product Videos Custom Field Harmonization code HTS #9030333800 Manufacturing country CN Product Reviews Write a Review Write a Review × Lisle 3-49V Digital Circuit Tester 28830 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *