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 properties Specification: Item Type: DIY Geiger Counter Parts Kit Material: Resin Geiger Tube Model: M4011 Type C Interface Power Supply: 5V 1A Sound And Light Alarm: Support Geiger Tube Parameters: Maximum Background Count Rate: 25 Counts/min Lifetime: >1×109 Pulses Detection: X, β, γ rays. Package List: 1 x PCB Board1 x Geiger Tube1 Package of Accessories Note: Please note that the color of the PCB board will be sent randomly, and make sure you will not mind before ordering.