Material: Geiger counter is made of durable material with high sensitivity and good durability. Intelligent Alarm: 3 types alarm methods, sound, vibration, light, real time measurement of dose rate and cumulative dose, when the dose exceeds the threshold, the monitor will automatically alarm. Portable and Lightweight: Radiation monitor meter measures approximately 102mmx69mmx26mm, small and lightweight, easy to carry and store, and convenient to use. Multifunction dDetector: Nuclear radiation detector, dual language display, switchable, LCD display, data observation is more intuitive. Wide Range of uses: Radiation dosimeter is suitable for various fields such as engineer construction, home decoration stone, industry, exploration, nuclear power plants, etc. Size Chart: 10.2cmx6.9cmx2.6cm/4.02inchx2.72inchx1.02inch Package Includes: 1 Geiger CounterNuclear Radiation Detector Note: Please allow slightly errors due to manual measurement and different monitors.