Geiger Counter Product Description Geiger Tube Specifications: Diameter: Φ10 ± 0.5mm Total Length: 90 ± 2mm Starting Voltage: 1 x 109 pulse Medium Temperature Range: -40°C to 55°C Size: 108 x 63 x 20mm Features: Power Supply: 5V or 1.5V (3x batteries); 1.2V (4x batteries), with current ranging from 30mA to 12mA. Detects gamma rays from 20mR/h to 120mR/h and soft beta rays with variability of 100 to 1800 variables/points/cm2. Equipped with sound and light alarm for notifications. Interrupt output interface available for connecting to a microcontroller and display on an LCD. Arduino compatible for easy integration. Supports a wide range of Geiger tubes, including M4011, STS-5, SBM20, J305, etc. (Operating voltage supported: 330-600V). PC connectivity for data acquisition and Matlab analysis and processing. Compatibility: Recommended for use with UNO R3 or any other microcontroller with 5V and external interrupt INT support. You can download SPI examples for Radiation Logger online. Use Logger Radiation as host computer software to set up a radiation monitoring station. Package Includes: 1 x Assembled Radiation System 1 x GM Tube 1 x Power Supply Cable 1 x Battery Holder (Batteries not included) 3 x Jumper Wires 4 x Nuts 1 x Acrylic Cover