This nuclear radiation detector can detect X-rays, Rays, X-ray can detect the radioactive dose of marble, jade, sea Amoy products, iodine 131, various unknown minerals for decoration. This is an simply assembled DIY geiger counter. If you are interested in this product, come and have a try, it will not let you down.Features:Two Alarm Ways: This nuclear radiation detector has sound and light indication function, the results will alert you in time.Multifunction Tool: It has the functions of real-time dose rate, average dose rate, cumulative dose rate, trend chart, etc.OLED Display Screen: A small OLED screen is adopted to clearly display the measurement results, you can see the data more clearly.ARM processor is adopted, which has quick operation speed and powerful processing function.Wide Applications: This nuclear radiation detector can detect X-rays, Rays, X-ray can detect the radioactive dose of marble, jade, sea Amoy products, iodine 131, various unknown minerals for decoration.Specifications:Material: printed circuit boardGeiger tube: j321 (compatible with M4011)Screen resolution: 128 * 64MCU: ARMDisplay accuracy: 0.001usv/hDetection display ranges: 0-9999usv / hPower supplys: USB, 5V, 500mAItem weight: 91g / 3.2ouncePackage size: 120 * 90 * 20mm / 4.7 * 3.5 * 0.8inPackage weight: 148g / 5.2ounceJ321 Pipes Specification:Diameter: 100.5mmTotal length: 90 2mmStarting voltage: Recommended working voltage: 380VMinimum Pings length: 80VMaximum Pings slope: 10% / 80VExtreme working voltage: 550VMaximum background count rate: 25 times / minuteService time: > 1 109 pulseTest: X radialNote:Test the cover tube close to the radiation target.Do not touching the component area during power on to avert electric shock. Please put your hand in the handheld area.Packing list:1 * Nuclear Radiation Tester1 * USB Cable