Fluke’s T+ and T+PRO electrical testers feature three AC/DC voltage detection indicators: light, sound and vibration. The testers have a hazardous voltage warning light and are capable of detecting voltage even when the battery is dead. Both models feature GFCI trip capability, built-in flashlights, continuity beeper and extra heavy-duty test leads and proves (both replaceable). The testers carry a Cat 4 600V and Cat 3 1,000V rating, and the T+PRO features a backlit digital display with 0.1V resolution.