This is a kind of fine quality geiger counter, with high detection sensitivity, especially for environmental radioactivity monitoring to detect traces of nuclear radiation. It can help detect the intensity of ray and detect high energy beta rays and also can detect electromagnetic waves which emitted by general electrical appliances, such as computers, TV, mobilephones, microwave ovens and other commonly used electrical appliance. Anti-interference ability, capable of reliable operation in complex electromagnetic environments. You can have a try. Handheld instrument design, built-in high-performance batteries for easy to carry around with you. Equipped with data record function, and the time interval can be set on the menu manually. The data can be exported to computer, it will generate a file a day, the electromagnetic data and Geiger count data are stored in different folders, and also support check the recorded data. The shutdown timer can be set, provide no shutdown/5 minutes/10 minutes/30 minutes shutdown settings. Support alarm value setting, language settings. Built-in temperature and humidity detection-sensor, the temperature measurement-range is -15C to 110C. High detection sensitivity, especially for environmental radioactivity monitoring to detect traces of electromagnetic radiation. It can help detect the intensity of ray and detect high energy beta rays. It also can detect electromagnetic waves which emitted by general electrical appliances, such as computers, TV, mobilephones, microwave ovens and other commonly used electrical appliance. Specifications: Name: Geiger Counter Model: JD-3001 Material: ABS Color: orange+black Cumulative dose equivalent: H P (10) 0.0usv-99.99msv Dose equivalent rate: H P(10)0.1USV/H-9.99MSV/H Response time: 3S Dose response: <20% (1usv/h-99.99msv/h) Energy response: <30% (48KeV-3.5MeV) Relative inherent error: <15% Battery: 1 * lithium battery, 3.7V, 1800mAh (included) Item size: 175 * 70 * 30mm / 6.89 * 2.76 * 1.18in Item weight: 230g / 8.11ounce Package size: 195 * 95 * 35mm / 7.68 * 3.74 * 3.58in Package weight: 250g / 8.82ounce Packing List: 1 * Geiger Counter