Features: For the detection of 20mR/h ~ 120mR/h of gamma rays and 100 ~ 1800 off variables / points 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. Supports most of the Geiger tube: M4011, -5, SBM20, J305, etc. (the 330~600V operating voltage of the Geiger tube can be supported). Support the computer (PC) data acquisition, Matlab analysis and processing. Plug it and you can directly measured nuclear radiation. Specifications: Geiger tube parameters: Technical parameters diameter: 100.5mm Total length: 902mm Starting voltage: Less than 350V 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 Item size: 118 * 63mm / 4.6 * 2.5in color: blue Material: PCB Package Contents: 1 * Assembled Radiation Detector System 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.