Features: This meter can test electric field radiation and magnetic field emission to reach the optimal-test result. It is used to test and learn electromagnetic radiation situation indoor and outdoor. Electromagnetic radiation monitors respond quickly to radiation and provide timely alarms in high-risk environments. The instrument is highly flexible and can measure environmental backgrounds. The detection value is-updated in real-time. Electromagnetic radiation detectors are small and portable. Permanently store-data in the event of a power outage. Beginners, seniors and advanced users can easily operate. The large LCD-screen of the electromagnetic radiation detector allows you to easily and quickly read real-time values. Widely used in single safety for protection-monitors and radioactive-indications, suitable for workers in the following fields: electromagnetic power-plants, accelerators, iron and steel-industries, chemical-industries, isotope-applications, industrial and-gamma non-destructive defect detection, Cobalt-source processing, gamma-radiation laboratories and environmental monitoring around nuclei. Equipped with a built-in electromagnetic radiation sensor, which can display the radiation value-on the clear LCD-digital display after processing by control micro-chips. Specifications: Material:ABS Size:Approx.16.7x6.5x3.7cm/6.57x2.55x1.45inch Power-supply mode: dry battery 9V 6F22 (shipped without battery by-default) Color: black+black sticker, black+red sticker, red+black sticker, red+red sticker. Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Host 1x English User Manual