Klein® Voltage Tester Pen, Non-Contact, Maximum Measurable Voltage: 12 to 1000 VAC, 4:1 Distance, LED Light Source, Backlit LCD, (2) AAA Battery, 5 to 500 Hz, Environmental Conditions: -20 to 482°F, IP54 Enclosure, 6-1/4 in L x 1-3/16 in W x 1-1/4 in H. Klein® NCVT-4IR Non-Contact Voltage Tester with Infrared Thermometer, 1000 VAC Maximum Measurable Voltage