Sperry Instruments VT611 Heavy Duty Voltage Tester with Solenoid Indication, Black & Yellow Tests voltage from 120-600V AC/DC and polarity indication for DC Voltage - UL Listed Voltage indication through both solenoid vibration and bright visual indicators Sta-Flex 36 inch cold weather leads with strain reliefs. Tester includes integrated snap-in lead storage and are spaced to fit a standard outlet for hands-free operation Durable heavy-duty design with over-molded rubber grips Automatic feature will select the proper function for the job your testing