Instructions: 1. Power button ON to boot, Boot automatically display real-time monitoring interface; After the shutdown, press and hold off zero current consumption; Triangular start button is used to measure the mean, Natural environment there is background radiation (background radiation) It will fluctuate within a certain range. 2. The top of the screen displays a blue font for the "second" real-time update of the dose rate, which is characterized by large fluctuations, update speed, real-time, is the mean of the middle of the red font display, is a mean dose rate period, when detecting an item or the environment when press the start button (this time can no longer move the tester); 3. Enter the state average measurement will display the measurement results after the end of the trend diagram below presents the average real measurement value of each moment, mean measurement is characterized by high precision, the effective dose equivalent response rate real environment, but the elapsed time is longer. 4. Horn button is used to select the sound source device, each time you press the switch once source. When the small speaker icon is displayed when the artificial alarm sound (only achieve this status only sound the alarm threshold), When the mute icon is displayed when that turn off all sources. 7. The scale key (right key) is used to switch the alarm threshold, Four optional 0.5 / 1.0 /2.0 /5.0High sensitivity. Wide measuring range. Advantages of long life. Using of sophisticated GM tube as the core sensor. Brand new and high quality. Detachable objects: beta (beta), gamma (γ), x-ray. Can detect any item or environment of radioactivity (ie, nuclear radiation).Use: 1. Material inspection.2. Environmental test. 3. Radiology Protection. 4. Radiopharmaceuticals screening. 5. Sensor Type: GM tubeParameter: 1. Energy Range: 50kev-1.5mev less than 30%; 2. Relative intrinsic error: less than plus or minus 10%; 3. Sensitivity: 80cpm / USV / co-60; 4. The maximum dose ev less than 30%; 2. Relative intrinsic error: less than plus or minus 10%; 3. Sensitivity: 80cpm / USV / co-60; 4. The maximum dose equivalent rate: 99.99usv / h; 5. Voice Source: Real particle sound / Alarm sound / Mute; 6. The use of ambient temperature: -25 ~+45℃; 7. Relative humidity: less than 95%; 8. Power supply: 2 x AA batteries(NOT included)colour: whiteMaterial: ABSPackage Contents:1 x Geiger Counter Nuclear Radiation Detector1 x English instructionsOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.