Features: This portable dose alarm adopts high sensitivity GM sensor (Geiger Counter) and advanced chip, it's suitable for detecting X-ray, γ-ray and Hard β-ray. Dual display of Dose Equivalent Rate (DER): current and cumulative. And the dual alarm values can be preset, with sound, vibration or light alarm method for selection. 128*64 resolution, clear digital display for easy reading, Chinese/ English switchable, with power off memory function. 2 AAA batteries (not included) operated, with under-voltage indication. Control buttons bring easy operation, 3 detecting units switchable (μSv/h, μGy/h, mR/h). Compact and lightweight, convenient to carry with you. It can be widely used in medical environment, factory, high-altitude/ ionizing/ nuclear radiation environment, steel/ mineral/ stone detection, Iodine 131 detection and so on. Note: Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: Black Material: ABS Resolution: 128*64 Ray Detection: X-ray, γ-ray, Hard β-ray Energy Range: 50keV~1.5MeV≤±30% (for 137Cs-) Normal Amount: within 0.5μsv/h Relative Inherent Error: ≤8% (137CS1mSv/h) Detector: Energy Compensation GM Tube (Geiger Counter) Sensitivity: 80CPM/μSv/h (for Co-60) Unit: μSv/h, μGy/h, mR/h Measuring Range: --Dose Equivalent Rate (DER): 0.08~1000μSv/h (Max. 10mSv/h) --Cumulative Dose Equivalent Rate: 0.00μSv~500.0mSv Alarm Setting: --Dose Equivalent Rate (DER): Select from 0.5, 1.0, 2.0, 2.5, 5.0, 10.0, 50.0, 100.0 μSv/h --Cumulative Dose Equivalent Rate: Select from 0.05, 0.5, 1.0, 2.0, 5.0, 10.0, 20.0, 50.0, 100.0 sSv Operating Environment: -10~45℃, ≤95% RH (45℃) Power Supply: 2 * AAA Battery (Not included) Item Size: 102 * 69 * 26mm / 4.02 * 2.72 * 1.02in Package Size: 18 * 14 * 5cm / 7.09 * 5.51 * 1.97in Package Weight: 200g / 7.05oz Package List: 1 * Dose Alarm