Ⅰ. Description[Nuclear Radiation Detector] This Geiger Nuclear Radiation Detector With Built-in Sensor, Fast Response Time And High Accuracy To Detect Gamma, Beta And X-Rays. Cumulative Dose Equivalent: 0-99.999Msv. Energy Range: 20Kev-3.0Mev 30%(137Cs) Ⅱ. [Smart Alarm] Enter the Alarm Setting Option To Set The Current Dose Alarm Value And Cumulative Dose Alarm Value. No Matter Whether The Detector Screen Is In Sleep State Or Working, The Detected Radiation Dose Exceeds The Alarm Threshold, The Radiation Monitor Will Automatically Alarm. Light/Vibration/Sound 3 Combined Alarm Modes For You To Choose. Ⅲ. Our Geiger Counter Has Other Settings Such As Alarm Setting, System Clock Setting And Changing Unit Setting And Language, You Can Operate In English (Default) Or Chinese. Easy Operation With One Hand. Ⅳ. [Working Principle] Uses Geiger-Counter.Counter.Counter Designed To Detect The Intensity Of Ionizing Radiation (Beta Particles, Gamma Rays And X-Rays). Use A Gas Tube Or A Small Chamber As A Probe. When A Voltage Is Applied. Recorded By A Connected Electronic Device. This is the measured number of rays per unit. Ⅴ. [Application Areas] Widely Used in Environments Where Ionizing Radiation Exists. Such as Radiation, Geological Survey, Iron, Inspection Vehicles, Nuclear Power Plants, Industry, Radiology, Radiology Laboratories, and the Like. Ⅵ. Power Supply: 3 AA Batteries (Not Included) Ⅶ. Color: As Shown Ⅷ. Material: ABS Ⅸ. Package Contents: 1 X Nuclear Radiation Detector 1 X Chinese and English Instruction Manual Only the Above Package Contents, Other Products Are Not Included. Ⅹ. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. Measurement Allowed Error Is +/- 1-3Cm.