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