Email us when you have problems.Features:100% new and high quality.Professional AC Voltage & 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 122℉ (0 to 50℃)Storage Temperature: -4 to 140℉ (-20 to 60℃)Humidity: < 85%RHBattery: 1 * 12V alkaline battery(Battery is not included).Dimensions: 15 * 2 * 2.5cmColor: Green & blackPackage Includes: 1 * MASTECH MS8902B Noncontact 20V-600V AC Voltage Metal Detector Tester MeterHave a beautiful day！