Feature 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.Item Type: DIY Geiger Counter KitMaterial: Circuit BoardGross Weight: 168g / 5.9ozProduct Size: Approx.11.3 x 6.3 x 1cm / 4.4 x 2.5 x 0.4inPurpose: nuclear radiation detectionBattery: AA 1.5V dry battery (3pcs required) (shipped without battery)Parameters of matching Geiger tube: The pipe is a tin oxide cathode, coaxial cylindrical thin wall structure (pipe wall density 50 10cg/cm2) pulse application halogen tube, which is used to detect 20mR/h~120mR/h, gammaraysand1001800offvariablesperpointsofthesoftbetaray.Technical Parameter Diameter: Approx.100.5mm / 0.40.02inTotal Length: Approx.902mm / 3.50.08inStarting Voltage: 350VRecommended Working Voltage: 380VMinimum Platform Length: 80VMaximum Platform Slope: 10% 80V (see M4011 below for details)Limit Operating Voltage: 550VMaximum Background Count Rate: 25 times/minuteService Life: 1x10^9 pulse .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Mainboard4 x Red Gasket4 x Small Screw4 x Large Screw4 x Nut1 x Acrylic Plate1 x USB Cable1 x Geiger Tube2 x Wiring1 x Battery Box