Description GC-01 type Geiger Counter Nuclear radiation detector built-in GM sensor, fast response time, high accuracy, can detect gamma, beta and X-rays. Cumulative dose equivalent :0.00uSv-500.0mSv. Energy range: 48kv-1.5mev ≤±30%(suitable for 137CS-γ) Enter the alarm Settings option to set the current dose alarm value and the cumulative dose alarm value. Whether the detector screen is asleep or working, the radiation monitor will automatically alarm if the detected radiation dose exceeds the alarm threshold. Three combined alarm modes of light/vibration/sound are available. Our Geiger counters feature alarm Settings, system clock Settings, unit Settings and language switching, and can be operated in Chinese or English. Easy to use with one hand. The GC-01 uses Geiger-Miller counters. A counter used to measure the intensity of ionizing radiation (beta particles, gamma rays and X-rays). The trachea or chamber is used as a probe. When the voltage applied to the probe reaches a certain range. Each ray ionized in the tube produced a pair of ions, It can be amplified to produce an electrical pulse of the same size. And are recorded by connected electronic devices. The number of rays per unit time so measured It is widely used in the environment where ionizing radiation exists. Such as home improvement radiation, geological survey, iron inspection, car inspection, nuclear power plant, industrial radiology, radiology laboratory, etc Specifications: Name: Nuclear radiation detector Material :ABS + silicone Battery :1 * built-in 1200mAh rechargeable lithium battery (included) Sensor: Geiger-Muller counter tube X-ray detection :X, gamma and beta rays Radiation dose rate range :0.01μSv/ h-1000μSv /h(up to 10mSv/h) Item size :120 * 78 * 27mm / 4.72 * 3.07 * 1.06in Package size :198 * 112 * 42mm / 7.80 * 4.41 * 1.65in Package weight: 245g / 9.64 oz