Shenzhen Wanyi Technology Co., Ltd. is a high-tech enterprise, mainly R & D and production of radiation detector and air ion counter, since its establishment in 2011 has obtained a number of patents and a number of group and national standard standards. The company has the ion calibration laboratory and Cs137, Co60 radiation source calibration process and radiation safety license. And launched the GM-100 series personal dosimeter, GM-300 series radiation dosimeter and MR-50 series radiation detector and radiation probe and radiation monitoring system.