Features Data Lock -- Press a button to lock the radiation value. An instrument used for two purposes can simultaneously test the radiation of the electric and magnetic field. Sound and light alarm: When the test result exceeds the safety value, the instrument will automatically trigger an alarm. Radiation Assessment -- To remind you to ensure the radiation value is within the safe range. Easy to Carry - Stylish design, compact size, simple operation, easy to carry and convenient for on-site measurements. Large LCD Screen-- Large clear LCD screen for easy reading. Specification: Model: GM3120. Material: plastic. Colour: as shown in the picture. Unit: V/m (Electric Field); μT (Magnetic Field) Accuracy: Electric: 1V/m; Magnetic: 0.01μT Range: Electric: 1-1999V/m; Magnetic: 0.01-19.99μT Alarm threshold: Electric: 40V/m; Magnetic: 0.4μT Display: 3-1/2 LCD screen Test Bandwidth: 5Hz-3500MHz Sample time: about 0.4 seconds Test mode: dual-mode synchronous test Range overshoot indication: LCD display "1" Operating temperature: 0°~50°C Relative humidity: <80% Storage temperature: -10~50℃ Relative humidity: 0~70% Power supply: 1 9V 6F22 battery (excluded). Size: approx. 12.5 x 6 x 3 cm/4.9 x 2.4 x 1.2 inches. Package weight: about 164g/5.8oz Package list: 1 x radiation tester. Package List