Feature: 1. High hardne and good electrical conductivity 2. Maintenance electrical measurement / screwdriver aist 3. Humanized clip design for easy electrical maintenance and portability 4. Fully insulated anti-fall material, durable and improved safety performance 5. Self-checking LED high-brightne bulbs: high-brightne works smoothly and is still clearly visible in the sun Uses: can be used in electronic factories, electrical appliances, car maintenance, household, etc., widely used Specification: Battery model: LR41 X 3 (not included) Measuring range: voltage 70-250V Bit material: chrome vanadium steel Shell material: ABS Size: About 140x20mm/5.51x0.79in Product function: 1. Neutral line/live line detection: the test result LED red light and green light indicate live line, green light indicates neutral line 2. Detection along the line: LED light on means the line is unblocked, LED light off means the line is disconnected 3. Wire switch: if the plug and the inner core of the wire are intact, the light will be on, and if it is not on, it means that the core wire is in poor contact Note: Because the battery cannot shipping,this pen don't included battery,please understand. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement.