Characteristics: One instrument used for two purposes can simultaneously test both electric and magnetic field radiation. Audible and visual alarm: When the test result exceeds a safe value, the instrument will automatically sound an alarm. Data Locking: Press one button to lock the radiation value. Radiation Assessment: A reminder to make sure that the radiation value is in a safe range. Large and clear LCD display for easy reading. Stylish design, compact size, simple operation, easy to carry and convenient to measure on site. Specification: Model: GM3120 Material: plastic; Color: shown as picture! Unit: V / m (electric field); μT (magnetic field) Accuracy: electrical: 1V/m; Magnetic: 0.01μT Range: Electric: 1-1999V/m; Magnetic: 0.01-99.99μT Alarm threshold: electrical: 40V/m; Magnetic: 0.4μT Display: 3-1 / 2 LCD display Test bandwidth: 5Hz-3500MHz Sample time: approximately 0.4 seconds Test Mode: Dual Mode Synchronous Test Indication of exceeding the range: LCD displays "1" Working temperature: 0 ° ~ 50 ° C Relative Humidity: <80% Storage temperature: -10 ~ 50 ° C Relative humidity: 0 ~ 70% Power: 1 * 9V 6F22 battery (off) Size: Approx.12.5 * 6 * 3cm / 4.9 * 2.4 * 1.2in Package weight : approx. 164 g / 5.8 oz Package List: 1 * Radiation Tester Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.