1,operation is very simple, a button to achieve a variety of work mode transformation 2,handheld instrument design, built-in high-performance battery, suitable for outdoor carry 3,The G-M counter is compensated and the energy response is improved 4,detection of high sensitivity, especially for environmental radioactive monitoring and detection of micro-nuclear radiation 5,probe type, effective protection of the probe is not damaged 6,keep the count sound, can quickly determine the surrounding environment of the radiation, the rapid positioning of the exact location of the radiation source 7,anti-interference ability, in the complex electromagnetic environment can work reliably 8,instrument display accuracy up to 0.01Sv / h (CPM mode up to 1CPM) 9,widely used, can be used for home environment, daily necessities, mineral rock, decorative stone and other radioactive detection can also be used for industrial or imaging equipment, radioactive leakage detection 10,professional company design can give a strong support 11,Each instrument is calibrated with a source to accurate and reliable measurement results Selection Guide: Model: GMJ3 14500 lithium battery (1200mah Built in) Uses: carry, industrial, home, strong radioactive research, use, can detect X ray GMJ3 precision is the level of scientific research. GMJ3 cover leather tube is an external split (split to facilitate the detection of holes or pit) The sensitivity GMJ3 is higher than GMV2: GMJ3 precision up to 0.01usv / h, is the highest accuracy. Colour:White Material:plastic Package Contents: 1 * Nuclear Radiation Detector 1 * leather covered external tube 1 * USB Cable 1 * 14500 lithium battery(built in) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.