... fixed or threshold pre-alarmed, it would emit sound-light alarm when the value displayed exceed the threshold or blocked, prevent ... power-failure, data can be stored permanently, and don’t lost.6,Low power consumption, multi-function, small size, convenient taking ... 662 KeV γ Radiation 1msv/h).7, Alarm response time: ≤3 seconds.8, Alarm functionDose rate threshold alarm: alarm threshold value: 0.5,1.0 ...