The structure of the dial indicator, l is a hardened contact, the lower end of the measuring rod 2 is screwed with a thread, and the upper end of the measuring rod has teeth. When the measuring rod rises, it drives the pinion 3 with 16 teeth. The large gear 4 with 100 teeth is installed on the coaxial of the pinion 3, and then the large gear 4 drives the middle pinion 5 with 10 teeth. A long pointer 6 is installed on the coaxial of the pinion 5
Therefore, the long pointer turns with it. A large gear 7 is installed on the other side of the pinion 5, and a hairspring is installed at the lower end of the shaft to eliminate the gap between the gears to ensure its accuracy. The upper end of the shaft is equipped with a short pointer 8． It is used to record the number of revolutions of the long pointer (when the long pointer rotates one circle, the short pointer rotates one grid). The function of the tension spring 11 is to make the measuring rod 2 return to its original position. Lines are engraved on the dial 9, which is divided into 100 divisions. Turn the watch case 10 to adjust the relative position of the dial scale line and the long pointer.
