People who have lived in Japan for a long time, say that before buying or renting house the Japanese tend to come into the room with the device and measure the intensity of radiation , even including electromagnetic radiation.
In the Japanese market Akihabara in Tokyo, the market appeared device SMTGEG4S. The device works with Android 2.2 and iOS 7 version. Measurements are carried out the X-rays, gamma rays and. accumulated dose. The measuring range of 0.1 to 200 Sv / h . The measurement error less than 30%. Weight counter about 6 grams. Dimensions - 10 mm x 47 mm. Price in Japan - about $ 40.
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