Features: Dual Testing Functions: the EMF meter can accurately detect and measure theelectric field radiation and magnetic field emission at the same time. It also can measure the environment (℃/℉). Audible and Visual Dual Alarm: if the tested value exceed the preset alarm value it will produce sound and alarm signal immediately. Wide Detecting Frequency & Measurement : 20Hz~300Hz magnetic field and 20Hz~3500MHz electric field of working frequency ; 0.01~199.9μT(0.1~1999mG) magnetic field and 0~1999Vm electric Field of measuring . User-friendly Design: soft operating buttons for the alarm value setting MAXAVG value switching and units conversion the pocket size EMF tester just powered by 3pcs AAA batteries which makes it convenient for using and carrying. High & Sensitivity: reliable for measure electric and magnetic field radiation of mobile phone hair dryer computer TV printer attendance machine refrigerator etc. Specifications: Material: ABS Magnetic Field Strength : 0.01~199.9μT(0.1~1999mG) Electric Field Strength : 0~1999Vm Magnetic Field Strength Resolution: 0.01μT0.01mG Electric Field Strength Resolution: 1Vm Magnetic Field Strength Frequency : 20Hz~300Hz Electric Field Strength Frequency : 20Hz~3500MHz Measurement : -10~50℃ Resolution: 0.1℃ Power Supply: 3 * 1.5V AAA battery (NOT included) Item Size: 130 * 50 * 27mm / 5.12 * 1.97 * 1.06in Item Weight: 85g / 2.99oz Package Weight: 127g / 4.48oz Package Size: 19.3 * 7.5 * 3.5cm / 7.60 * 2.95 * 1.38in Packing List: 1 * EMF Tester 1 * Manual (English)