Visual and sound indication of radiation for detecting dangerous radiation levels or radioactive materials in your environment. Geiger tube specifications: - Diameter: 10 ± 0.5 mm; Total length: 90 ± 2 mm - Recommended operating voltage: 380 V - Minimum plateau length: 80 V; Maximum plateau slope: 10%/80 V - Extreme operating voltage: 550 V - Maximum count rate: 25 counts per minute - Lifetime: > 1 x 10^9 pulses - Operating temperature: -40 to 55 °C - Size: 108 x 63 x 20 mm System and power: - Power options: 5 V supply or 1.5 V 3x battery; 1.2 V 4x battery - Current consumption: 12–30 mA - Detection range: gamma rays 20 mR/h to 120 mR/h; soft beta 100 to 1800 counts/cm2 - Alarm: sound and light indicators - Interface: interrupt output for connection to a microcontroller and display on an LCD Compatibility and analysis: - Supports most Geiger tubes, including M4011, STS-5, SBM-20, J305; operating voltage 330–600 V - PC data acquisition support with Matlab analysis and processing Applications: - Field radiation surveys with battery operation for portable monitoring - Laboratory area safety monitoring and quick alerting - Integration into DIY or professional projects with MCU/LCD display and PC-based data logging and analysis