1.The item has visual and sound indication of the radiation and can be used as detector of dangerous radiation levels or radioactive materials in your environment. 2.Geiger tube parameters:diameter:Φ10±0.5mm; Total length: 90±2mm;Starting voltage: Recommended operating voltage: 380V; Minimum plateau length: 80V; Maximum plateau slope: 10%/80V; Extreme operating voltage: 550V; The maximum count rate: 25 times / min; Life: > 1 x 10^9 pulse;Medium temperature: 40 55 ℃; Size:108x63x20mm 3.System parameters:5V power supply, or 1.5V 3x battery; 1.2V 4x battery, current: 12mA 30mA,for the detection of 20mR/h 120mR/h of gamma rays and 100 1800 off variables / points / cm 2 of the soft beta ray.Sound and light alarm;Interrupt the output interface, through this interface can be connected to the microcontroller and then displayed on the LCD. 4.Supports most of the Geiger tube: M4011, STS5, SBM20, J305, etc. (the 330600V operating voltage of the Geiger tube can be supported).Support the computer (PC) data acquisition, Matlab analysis and processing.