RD 650 nuclear radiation detector uses a higher-precision Geiger- counter. Counter for detecting the intensity of ionizing radiation (beta particles, gamma rays and x-rays). Use a gas tube, Every time the ray ionizes in the Geiger- tube to produce a pair of ions, an electrical pulse of the same size can be amplified and recorded by the connected electronic device, so that the number of rays per unit time can be measured. It mainly used to detect nuclear power plants, industrial mines, seafood, cosmetics, marble, X-ray and other radiation environment. : Detectable types: , Y, X rays Dose current rate: 0.00-9999Sv Cumulative dose equivalent:0.00Sv~500mSv Power supplys: 1*9V battery(battery is not include) Material: ABS colour: black Package Contents: 1 x Nuclear Radiation Detector 1 x English User Manual Only the above package content, other products are not included. Note: Light reflection 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.