Features:  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 -15°C to 110°C.  High detection sensitivity, especially for environmental radioactivity  monitoring to detect traces of electromagnetic radiation.  It can help detect the intensity of γ 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.  Comes with a plastics storage box, orderly storage and easy to carry around with you.    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-1.3MeV)  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 * 1.38in  Package weight: 470g / 16.58ounce    Packing List:  1 * Geiger Counter  1 * Plastics Box