Features:Professional AC Voltage Detector & Metal Detector.Non-contact test.Designed for measure AC voltage & Metal.Voltage sensitivity is from 20V to 600V AC.Metal detecting distance is less than 15mm.The sensitivity of AC voltage adjustive.Sound and light instructions.Auto power off.It is designed according to EN61010-1/600V CAT concerning safety requirements.Safe， professional and easy-to-use.Small and compact pen， design for easy carrying.Specifications:Voltage Sensitivity: 20V to 600V ACFrequency: 50-500HzMetal detection distance: <15mmOperating Temperature: 32 to 122F (0 to 50degree)Storage Temperature: -4 to 140F (-20 to 60degree)Humidity: < 85%RHBattery: 1 * 12V alkaline battery(batteries are not include)Item dimensions: 15 * 2 * 2.5cmItem weight: 50g Package size: 23 * 9.6 * 3.5cmPackage weight: 80gPackage including:1 * AC Voltage Detector