Click to expand Tap to zoom Lisle, Computer Safe Circuit Tester for Univ. by Lisle Currently unavailable £23.65 | / SKU MCS530731 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Currently unavailable DescriptionLisle, computer safe circuit testerDetails3-28V. Will not damage sensitive electronics. Draws less then 21 mA at 12V DC. Red light for positive and green light for negative polarity. Note: See 530732 for replacement bulb.Univ.