1Applicable: This DIY opening source Geiger counter kit is compatible for radiation detector, please confirm the detector model before use. 2Purpose: Nuclear radiation detection, for detecting 20mR/h120mR/h gamma rays and 1001800 off variables per points of the soft beta ray. 3Sound and Light Alarm: This DIY detector has a sound and light alarm function, which will alarm in time when detecting abnormal data. 4GM Tube: The tube is a tin oxide cathode, coaxial cylindrical thin wall structure (pipe wall density 5010cg/cm2), pulse applied halogen pipe. 5Suggestion: Please remember that building materials may contain natural radionuclides, which is why you should be careful to choose materials when building, because they will pose a great threat to your health, when moving to a new place, you must check there is no radiation.1 x Mainboard4 x Red Gasket4 x Small Screw4 x Large Screw 4 x Nut 1 x Acrylic Plate1 x USB Cable1 x Geiger Tube2 x Wiring1 x Battery Box