1. Built-in J305 high-sensitivity Geiger tube 2. Adopt ARM processor, fast computing speed 3. Real-time dose rate, average dose rate, cumulative dose rate, trend chart and other functions 4. Only sound and light dual indication function, when incident particles or rays are detected, the buzzer and indicator light will prompt Summary: This product uses J305 Geiger tube, which has high detection sensitivity and can detect x-rays, gamma rays, and beta rays. It can detect radioactive doses of marble, antiques, jade, iodine 131, and various unknown minerals used for decoration. Parameters: Real-time dose: 0-999.9usv/h Cumulative dose: 0-9999sv/h Life: ≥10⁹ pulse number Operating temperature range: -40℃-+55℃ Size: 170x41x26mm Power supply interface: TYPE-C Working voltage: 5V (current needs to be Greater than 100mA) Screen: OLED (resolution: 128x64) Colour:Transparent Material:ABS Note: This product does not have a built-in battery, you need to use a TYPE-C charger to power it Package Contents: 1 x Nuclear Radiation Detector Only the above package content, other products are not included. Note: Light reflection 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.