【Dual Functionality】 Simultaneously measures both electric and magnetic fields, providing comprehensive electromagnetic radiation detection. 【High-Precision Sensor】 Equipped with a built-in high-precision electromagnetic radiation sensor and microcontroller chip for fast and accurate measurements. 【LED Indicator】 Features an LED light indicator for clear and instant visualization of radiation levels. 【Portable Design】 Compact size and lightweight construction allow for convenient carrying and use in various settings. 【Versatile Application】 Suitable for multiple environments including home, industrial, and medical settings, detecting high-frequency radiation from sources like mobile phones and base stations.Specifications: Measurement Range: 0-20+ mG Power Source: 6F22 9V battery Accuracy: 5% Dimensions: 142 x 52 x 29 mm Measurement Frequency: 50/60 Hz Weight: 170g Operating Temperature: 18~49°C (0~120°F)