But , usually , detecting of the gauge with pointer is by manual work , after long time for vision work , eyes will get tired , and this leads to low detecting precision and long detecting period 現在,對很多沒有計算機操作界面的指針式儀表的檢定通常都是由人工來讀數和調節(jié),然而,人的眼睛在大量的視覺工作之后會出現視覺疲勞,造成了檢定精度低,檢定周期長。