C1 objective lens micrometer (1/100) The objective micrometer is a scale ruler with a total length of 1mm, divided into 100 equal parts, each division value is 0.01mm, that is, there is a circle with a diameter of 3 and a line thickness of 0.1mm outside the 10m engraved line. In order to find lines when focusing. There is a cover glass with a thickness of 0.17mm on the score line to protect the score line from damage for a long time. C2 type mesh eyepiece ruler C2 type (nth power of root 2) mesh eyepiece ruler (nth power of root 2)L/200 For the mesh eyepiece ruler, the ratio of the length to the width of the rectangular grid is 2:1, that is, the length is L and the width is L/2. The 0 line divides the rectangle into two squares on the left and right. The particle counting area on the left and the length measurement area on the right. The square on the left is equally divided into three in the vertical direction and into two in the horizontal direction to form six small rectangles. Counting particles in a certain area, the square on the right is equally divided into three parts in the vertical direction, and into several parts in the horizontal direction. The upper part of each grid line is engraved with O, 4, 6, 8, 9...13 And other labels. On the upper and lower sides of the rectangular grid, there are a number of different sizes, but the upper and lower corresponding circles, the upper part is a hollow circle, the lower part is a solid circle, each has a label n=1, 2, 3...9, which can be used Quickly determine the diameter of dust. The calculation formula D=L/200 is engraved on the micrometer net, where L represents the length of the bottom side of the rectangular grid. n represents the label of each circle and the label of each grid line in the horizontal direction of the square on the right. D represents the diameter of each circle and the distance from the O line of the square on the right to each ruled line. For example, the self-diameter D4 of the fourth circle step is equal to the distance from the O line to the fourth ruled line. The true diameter D5 of the No. 5 circle is equal to the distance from the O line to the No. 5 grid line (noted at the end of the label). I analogize. There are 10 equal division lines engraved on the left end of the micrometric grid, and each division is L/20. C3 type 0.1 ruler eyepiece ruler 0.1-foot-shaped eyepiece ruler, the scale is 5mm, divided into 50 equal parts, each division value is 0.1mm, and the glass slide diameter is 19mm. C4 type 0.05 ruler eyepiece ruler 0.05-foot-shaped eyepiece ruler, the scale is 5mm, divided into 100 equal parts, each division value is 0.05mm, and the glass slide diameter is 19mm. C5 0.5 mesh eyepiece ruler 0.5 mesh eyepiece ruler, the scale area is 55mm2, each is divided into 10 equal parts, each small square is 0.25mm2, the glass slide diameter is 19mm. C6 type 0.2 mesh eyepiece ruler The scale area of the 0.2 mesh eyepiece ruler is 55mm2, each is divided into 25 equal parts, each small square is 0.04mm2, and the glass slide diameter is 19mm. C7 type 0.1 coordinate eyepiece ruler 0.1 coordinate-shaped eyepiece ruler, the length of the vertical and horizontal coordinates is 10mm, each divided into 100 equal parts, each division value is 0.1mm, and the glass slide diameter is 19mm.