Non-Contact Voltage Tester - For Professionals - Guaranteed - AC Circuit Breaker Detector Pen - Made To Test GFCI Socket Outlets Live Wires All The Way Up To External Transformers - By Katzco SUPER CONVENIENT - The compact size of this no contact voltage tester Pen makes for easy storage and accessibility wherever you need it. All you need to do is place near something that has ac voltage and it will light up. EASY TO USE- This No Contact Circuit testing pen is incredibly easy to use on ac circuits of up to 90 volts. Simply point and place the pen tip anywhere near ac voltage and the pen will light up to indicate any voltage that is detected. ERGONOMIC DESIGN  The slim ergonomic design of this tester ensures you have a tight comfortable grip while using. Pen like design can fit in your pocket so you can bring it virtually anywhere. MULTI USE  Can be used in a variety of applications. Mechanics, electricians, and homeowners alike will find great use with this tester. Test for broken or live wires, fuses and circuits. light sockets, taillights, sparkplugs, faulty sockets, distributors, generators, car batteries, headlights, turn signal circuits, motorcycles, suvs, switches, and power outlets. The possibilities are endless! BANG FOR YOUR BUCK  These inexpensive circuit testing pens are the best value you can possibly get. They provide optimal results and are durable while being very low cost.