1. Sound and light alarm2. Support most Geiger tubes: M4011 can be installed directly, other models cannot 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 shows DC 170 volts)3. An external screen or pointer meter can be used as monitoring, the output signal is interrupt output, the waveform is the falling edge of the pulse, and the low level is valid.4. The circuit structure is stable and the failure rate is extremely lowBasic parameter:Geiger Tube Model: M4011Type-C interface power supply, 5V1APower consumption current: 20mADimensions: 61 x 92 mmWeight: about 40g Tube M4011 Specification:Diameter: 100.5mmTotal length: 902mmStarting voltage: more than the 350VRecommended working voltage: 380VMinimum ping length: 80VMaximum ping slope: 10%/80VExtreme working voltage: 550VMaximum background count rate: 25 times / minLifetime: more than the 1 x 109 pulsesStyle:B Assembled Colour:blackMaterial:plasticPackage Contents:1 * Radiation Detector KitOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.