Specification: senson:48mm geiger counter Measurement range:0.05usv-50msv Measurement accuracy:-17%-+25% based on 137 Cs y Working environment:temperature -20C-50CHumidit<95%RH,no condensation Endurance time:50 hour(continuous measurement,screen sleep) Charging time:2-3hour Charging interface:type-c interfac(the green light is always on when charging and the full charge is off) Size:diameter 15.3mm length 108mm Product Dimensions : 0.55 x 0.55 x 4.13 inches Batteries : 1 Lithium Metal batteries required. (included) Features: PORTABLE DESIGN: Radiation detector uses a 48mm Geiger counter tube, which can detect the radiation level of any object or any environment at any time.Such as radiation detection, antiques, building materials, furniture, food, etc.Small volume and the clip design is easy to carry HIGH DETECTION PERFORMANCE:Ultra-fast detection with small measurement error margins,geiger radiation-hardened detector detects Beta Gamma X-ray almost instantly,with real-time updates of radiation dose data and interval averages every second ULTRA-HIGH SENSITIVITY:Radiation detector measured and calibrated by the national metrology institute,with high data accuracy.When the dose rate radiation dose exceeds the threshold,an audible and flashing alarm will automatically sound LOW ENERGY CONSUMPTION-OLED DISPLAY:Built-in powerful rechargeable lithium battery,the radiation detector only needs to be charged for 2-3 hours,and the display can continue to measure continuously for 50 hours after automatic sleep when working.