Clear Current Indication: Equipped with an indicators light design, these tester pens provide instantly visual confirmation of current presences or absence for safe and efficient electrical testing Wide Application Ranges: Ideal for home, industrial, power, factory, and maintenance use by electricians, electronics enthusiasts, and general users needing compact electrical testing tools Versatile Crossed Switches Design: Each pen features a bidirectional character crossed switches, allowing multi functional use as both a precisions screwdriver and voltages tester Clear Views: Made with a clear, impacts resistant insulated handle and hardened 45 steel shafts, ensuring long lasting durability and resistance to breakage during use Double Purpose tester Pen: This 5 piece set features double headed tester pens with insulated handles and 45 steel shafts, perfect for both voltages detect and screwdriver applications in various scenarios, Manufacturer: Kaeltsyn