Portable Size: This handheld nuclear radiation and electromagnetic radiation detector is portable in size and easy to carry, so you can put it in your bag and take it with you and grip it for use.Compact size, and portable, built-in high-accurate chip, practical and reliable to use. Radiation Detect: The detector is used to measure X, and rays radiation, it is optimal for measuring small changes in radiation levels, and has high sensitivity for most commonly used nuclides. Lithium Battery: Built-in rechargeable lithium battery, low consumption and support for repeat use, economical and practical. Wide Application: This radiation tester can be widely used in nuclear power plants, accelerators, the iron & steel industry, the chemical industry, isotope applications, radiology laboratories and ambient monitoring of nuclear facilities. Sensor type: Geiger counter Export computer: 10000 groups Charging: USB 5V input Sensitivity: 80cpm/sv/(Co-60) Test accuracy: 0.01sv/h Real-time range: 0-99.99sv/h Cumulative range: 0-99.999msv Real-time error: 10% Mean error: 3% Attention: 1. This product contains a lithium battery. Please use a standard DC-5V power supply to charge it. 2. Do not use this product in high temperature and high humidity environments to avoid inaccurate data or circuit failure. 3. Do not use this product in ultra-high radiation environment, so as not to damage the sensor. 4. This product is not waterproof. Please avoid water droplets or use them underwater. 5. This product contains precision electronic components. Please do not pierce the needle or sharp object into the product. size: about 120 x 26 x 27mm Material: ABS colour: white Package Contents: 1 x nuclear radiation tester 1 x usb cable 1 x Chinese and English instructions 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.