Features: Mainly responsible for X, r, hard ray radiation monitoring in various radioactive work areas Wide range of applications: it can be used in nuclear power plants, accelerators, iron and steel industry, chemical industry, r-radiation, radioactive laboratories and monitoring of the surrounding environment of nuclear facilities Supports two alarm modes: sound and vibration. You can set the alarm value by yourself. It can automatically store the last measured data when the power is off, so that your data is not easy to lose. It supports two measurement modes: fast mode and Smooth mode. With the function of holding the maximum value, it can automatically maintain the maximum value Specification: Material: ABS Sensor Type: Geiger Counter Measuring range: 0.00-1000uSv/h Measurement accuracy: 15% +6/p Energy response range: 0.1-3.0 Mev Measuring unit: uSv/h, mR/h Cumulative time: 1-9999 minutes can be set Working temperature: -30~60 Working humidity: 5%-95%RH (non-condensing) Measuring range: -0.15uSv/h~36000uSv/h Peak range: "0.1~1000 mR/sec Detection range: CT/X-ray/Medical equipment BY4DO Iodine 131 Power: 1 * AA battery (not included) Package size: 90 * 80 * 45 mm / 3.5 * 3.1 * 1.8 inches Package Weight: 150g / 5.3oz Packing list: personal radiation dosimeter + instruction manual + Type-c data cable + packing box