Feature: 1. Dual Testing Functions: the EMF meter can accurately detect and measure electric field radiation and magnetic field emissions simultaneously. It also measures environmental temperature. 2. Audible and Visual Dual Alarm: if the tested value exceeds the preset alarm threshold, it will emit an audible and visual alarm signal immediately. 3. Wide Detecting Frequency & Measurement Range: 20Hz~300Hz magnetic field and 20Hz~3500MHz electric field working frequency range; 0.01~199.9μT (0.1~1999mG) magnetic field and 0~1999V/m electric field measurement range. 4. User-friendly Design: soft operating buttons for alarm value setting, MAX/AVG value switching, and unit conversion. The compact pocket-sized EMF tester is powered by 3 AAA batteries, making it convenient to use and carry. 5. High Precision & Sensitivity: suitable for measuring electric and magnetic field radiation from mobile phones, hair dryers, computers, TVs, printers, time clocks, refrigerators, and other common electronic devices. Specifications: Material: ABS Magnetic Field Strength Range: 0.01~199.9μT (0.1~1999mG) Electric Field Strength Range: 0~1999V/m Magnetic Field Strength Resolution: 0.01μT/0.01mG Electric Field Strength Resolution: 1V/m Magnetic Field Strength Frequency Range: 20Hz~300Hz Electric Field Strength Frequency Range: 20Hz~3500MHz Temperature Measurement Range: -10~50℃ Temperature Resolution: 0.1℃ Power Supply: 3 x 1.5V AAA battery (NOT included) Item Size: 130 x 50 x 27mm / 5.12 x 1.97 x 1.06in Item Weight: 85g / 2.99oz Package Weight: 127g / 4.48oz Package Size: 19.3 x 7.5 x 3.5cm / 7.60 x 2.95 x 1.38in Packing List: 1 x EMF Tester 1 x Manual (English)