Easy to Use: geiger counter with smaller body, larger screen, clearer measurement data and easier operation Application: nuclear radiation detector can be applied to material inspection, environmental test, radiology protection, radiopharmaceutical screening, etc Function: digital nuclear radiation detector built in GM tube sensor, can test Beta, Gamma and X-ray Wide measuring range: high sensitivity nuclear radiation detector, it is designed with wide measuring range, has a long service life Operation: handheld geiger counter with mute, alarm, particle sound selection button, test, mean value reset retest selection button, backlight can be turned on or off This handheld geiger counter adopts sophisticated GM tube as the core sensor, with high sensitivity, wide measuring range. The natural environment in which we live has a certain amount of radiation, real-time data will fluctuate within a certain range, and the daily use of nuclear radiation detector helps to refrain radiation hazards in daily life. Features Geiger counter -Color: Black. -Material: Plastic. -Size: 10.5x7x3 cm/4.13x2.76x1.18 inch. Detectable species: Beta Gamma X-ray Sensor Type: GM tube Energy Range: 50kev-1.5mev less than 30% Relative intrinsic error: less than plus or minus 10% Sensitivity: 80cpm / USV / co-60 The maximum dose equivalent rate: 99.99usv / h Voice Source: Real particle sound / Alarm sound / Mute The use of ambient temperature: -25 ~+45 Relative humidity: less than 95% Power supply: 3 x AA rechargeable batteries(NOT included) Instruction: 1. Turn the power button ON to boot, Boot automatically display real-time monitoring interface; After the shutdown, press and hold OFF zero current consumption. 2. Triangular starf button is used to measure the mean, Natural environment there is background radiation (background radiation) It will fluctuate within a certain range. 3. Horn button is used to select the sound source device. 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. 4. The scale key (right key) is used to switch the alarm threshold, Four optional 0.5 / 1.0 /2.0 /5.0 5. 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) 6. Enter the