Features: *Self-checking function, check whether the electric pen is working normally, and can detect the connection and disconnection of the line; *It can detect alternating current and direct current at the same time, and distinguish the positive and negative polarities of direct current; *AC live wire and neutral wire detection can distinguish and distinguish the neutral live wire; *This paragraph has the characteristics of high sensitivity and can be used for induction detection operation; *The sealing function IP56 waterproof level is added to prevent the internal parts from getting wet and improve the service life; *Increase the brightness of the light-emitting diode (LED), which is convenient for users to clearly distinguish; *The resistance value of the resistance is improved, the safety range of the test is effectively improved, and the safety is increased; *The pen-hanging design is convenient for users to carry; *The blade is made of 45#Steel, which enhances the firmness and can also have the function of a screwdriver; *The circuit board is made of advanced engineering board, and the design is reasonable, which enhances the performance of the test pen. Specification: Product name: Screwdriver test pencil Material: 45#Steel, Plastic Color: Blue(As shown ) Length: (Approx. ) 128mm/5Inch Screwdriver Bit Size: 3.0 - Measurement Range: 100-500V Suitable for: property, decoration, home, car, mining, enterprises, schools, daily repairs, etc. Function: use it to test circuit and distinguish whether an object is electrified. Quantity: 1Pc Package Included: 1 × Screwdriver test pencil Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data. Made of high quality material, durable and practical to use. Perfect functions,give you a wonderful experience. We will ship it ASAP,when you place the order. If you have any questions, please feel free to contact us, we will solve it for you. Every customer can enjoy 30 days refund or replacement for Damaged/Quality Issues.