They satisfy the hard operating conditions and the high requirements that are placed on accuracy and life of the measuring instruments . in all instrument designs the dial is illuminated by a special anti-glare optical wave guide the lighting can be done either indirectly by means of light slots or directly by an incandescent lamp or led in the mounting ba9s 这种产品应用在一些操作环境比较艰难的条件下,和一些对产品的精确度和使用寿命要求比较高的客户。仪器设计中的刻度盘被一个专门的防眩光波导向照亮。间接的由光栅或直接由白炽灯或ba9s上的发光二极管来照明