FY-803B Geiger counter nuclear radiation detector with built-in energy compensated tube, fast response in 3 seconds, capable of detecting gamma, beta, and X-rays. Energy response: 48keV~1.5meV. Sensitivity: 0.25cps/usv/h (relative to 137Cs) can be used for timed and real-time testing, view historical record curves, and set detection interval time, alarm threshold, alarm , data management, time, unit, and other settings Our Geiger counter can manually set two sets of alarm thresholds. When the alarm threshold is exceeded by 1, the yellow light will , and when the alarm threshold is exceeded by 2, the red light will . There are three combined alarm modes available: light, vibration, and sound During measurement, measurement data records can be automatically saved, with a maximum capacity of 111500 historical detection data. Records can be viewed at any time, and it also carries a 2000mA rechargeable battery, which can continuously detect for more than 20 hours This nuclear radiation testing instrument can be widely used in radiation medicine, nuclear laboratories, nuclear power plants, geological surveys, steel and metals, customs airports, and personnel who are easily exposed to nuclear radiation Power supply: Power supply : 3.7V/2000MAH Product power consumption: Less than23mw Usage environment: Atmospheric pressure: 86Kpa~106Kpa Relative humidity: 20%~85% Storage temperature: -20~50 size: about 16 x 8 x 4cm Material: ABS colour: Black Package Contents: 1 x geiger counter 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.