Pen Type Nuclear Radiation Detector Geiger Counter Sound Light Alarm 1. Adopt GM counter tube, mainly used for monitoring X, Y and β rays, high sensitivity and accurate measurement. 2. OLED display screen: clear display of instantaneous dose, average dose and accumulated dose rate, visible at night. 3. Easy to use: one key start, automatic test, if the test result exceeds the standard, there is an acoustic and optical alarm. 4. Built-in lithium battery power supply, power saving and durable. 5. 0.7 ounces of weight and small size like lipstick, very convenient to carry. Parameters: 1. Material: ABS material 2. Sensor: 48mm Geiger counter tube 3. Measurement range: 0.05uSv-50mSv 4. Measurement accuracy: -17% ~+25% based on 137Csy 5. Charging time: 2-3 hours 6. Alarm response time: less than 10s 7. Battery: 3.7V, 300mAh lithium battery 8. Working environment: temperature -20 ~ 50 degrees Celsius, humidity less than 95% RH no condensation 9. Product size: 108 x 18 x 15.3mm 10. Item weight: 19g Packing list: 1 x Geiger counter 1 x Type-C cable 1 x Manual (English)