1SUPPORT MOST GEIGER TUBES: M4011 can be installed directly, other models can not be installed on the board, but the flying leads can also be used (digital multimeter measures the positive pole of the Geiger tube to the negative pole of the power supply, adjust the blue potentiometer until the multimeter displays DC 170volt)_x000D_ 2INTERRUPT OUTPUT SIGNAL: Can be monitored by an external screen or a pointer meter. The output signal is interrupt output, the waveform is the falling edge of the pulse, and the low level is valid_x000D_ 3LOW FAILURE RATE: The circuit structure of DIY geiger counter parts kit is stable and the failure rate is extremely low_x000D_ 4VARIOUS DETECTIONS: Can detect X rays, gamma rays, beta rays, and can perform radioactive dose detection on marbles fordecoration, antiques, jades, overseas shopping products, iodine 131, and various unknown minerals_x000D_ 5EXCELLENT RESIN MATERIAL: Adopt good quality resin material, possess impact resistance, scratch resistance, environmental protection, heat resistant, low temperature resistant, possess excellent electrical properties 1 x PCB Board1 x Geiger Tube1 Package of Accessories Item Type: DIY Geiger Counter Parts KitMaterial: ResinGeiger Tube Model: M4011Type C Interface Power Supply: 5V 1ASound And Light Alarm: SupportGeiger Tube Parameters: Start Voltage: <350VRecommended Working Voltage: 380VExtreme Working Voltage: 550VMaximum Background Count Rate: 25 Counts/minLifetime: >1109 PulsesDetection: X, , rays