Handheld wide-range multifunctional instruments for continuous, short-term and pulsed x-ray and gamma radiation dosimetry - Handheld multifunctional wide-range instruments - Tissue-equivalent detector - scintillation plastic with heavy metal admixtures - Gamma and beta radiation source search - Short-term radiation from 30 ms (AT1121, AT1121A) and pulsed radiation from 10 ns (AT1123) - Exposure time assessment - Built-in LED stabilization system of the measuring path providing no need to use a reference source - Large backlit LCD - Remote measuring with remote control - Audible and visual alarm at threshold exceeding - Logging up and transferring measurement results to PC - Three types of power - Extreme environment operation