Measurement of X-rays and gamma waves environmental radiation dose equivalent and equivalent ambient radiation dose rate. Housing made of impact, Resistant abs plastic convenient menu search mode compact reasonably priced device intended for ambient dose equivalent rateand ambient gamma radiation dose equivalent rate measurement. Device operating principle is derived from the process of count rate measurement ofimpulses, Generated in geiger, Muller counter tube under the influence ofgamma radiation. Count rate is converted automatically into measurable physical valuesthroughout the range. Energy compensating filter allows correcting energydependence of senstivity efficiently in entire energy range of gamma radiation. Microprocessor, Based unit is responsible for controlling the radiation monitoroperating modes, Calculations, Storing and displaying measurement results andfor self, Checking function. Rated sensitivity of each measurement range sets up automatically duringcalibration procedure. Low weight and small size automatic compensation of intrinsicdetector background sound and visual alarm in case thresholdlevel is exceeded for dose and dose rate rapid reaction to statistically significantchange of dose rate measurementprocess restart dose rate and dose thresholds can beselected in entire measurement range andsaved when the radiation monitor isswitched off field operation capability over a widetemperature range in search mode each registered gammaquantum is indicated by a sound signal As high as 100 measurement results can bestored in non, Volatile memory withinformation about measurement current time, Date andtime measurement results, Dateand battery life indicator is displayed onmatrix lcd screen bright white backlit lcd, Screen