HFS-AA1 is a small, highly sensitive radiation dose alarm designed primarily to monitor X-rays, gamma rays and hard rays. The instrument uses energy compensation universal counter as detector, which has the characteristics of high sensitivity, strong anti-interference ability and accurate measurement. It uses a powerful microprocessor and has a TFT display to make operation easier. The product itself has three alarm modes: sound, flash and vibration, and the alarm threshold can be set arbitrarily. When the alarm threshold is reached, an alarm will be issued to remind the staff to pay attention to safety. The main technical indicators of the instrument meet international standards.