Overview Reviews Product Description Safe for automotive computers. Wont damage sensitive electronic components. Draws less than 21 mA. at 12 volts DC. Operating range 3-28 volts. The red light indicates positive polarity, green indicates negative polarity. Lisle Tools Catalog Product Videos Custom Field Harmonization code HTS #9030399090 Manufacturing country US Product Reviews Write a Review Write a Review × Lisle Computer Safe Circuit Tester 24550 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *