Feature 1 SUPPORT 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) 2 INTERRUPT 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 3 LOW FAILURE RATE: The circuit structure of DIY geiger counter parts kit is stable and the failure rate is extremely low 4 VARIOUS 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 5 EXCELLENT RESIN MATERIAL: Adopt good quality resin material, possess impact resistance, scratch resistance, environmental protection, heat resistant, low temperature resistant, possess excellent electrical propertiesItem 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 Package List1 x PCB Board1 x Geiger Tube1 Package of AccessoriesNotePlease note that the color of the PCB board will be sent randomly, and make sure you will not mind before ordering.