1. Imaging method: Imaging method is a measurement method that uses the markings of the central Olympus microscope to aim and locate the imaging method. When measuring, it is usually first aimed at the edge of the image of the measuring piece with the engraved line on the (meter line) dividing plate, and the value is read on the reading Olympus microscope. Then, the worktable is moved to aim at the other side of the image of the measuring piece with the same engraved line, and * * readings are made. The difference between two readings is the measured value of the tested object.

2. Axial cutting method: Axial cutting method is a measurement method that uses the markings of a central microscope to aim and locate the axis line of the measuring piece and the engraved line on the measuring knife. The measuring knife is an accessory of Wangong Display. There is a engraved line on its surface, with two sizes of 0.3 and 0.9 millimeters from the engraved line to the cutting edge. When measuring, place the measuring knife on the measuring knife pad, and the engraved line surface passes through the axis of the measuring piece, making the cutting edge of the measuring knife tightly contact the measured surface. Aim with the corresponding meter line, measure the distance between the engraved lines of the two measuring knives, and indirectly measure the measured value of the measured piece. To avoid calculation during measurement, two sets of four symmetrically distributed parallel lines are engraved on both sides of the vertical meter line in the middle. The distance between each set of engraved lines and the center engraved line is 0.9 and 2.7 millimeters, respectively, which is exactly three times the distance between the cutting edge of the measuring tool and the engraved line of 0.3 and 0.9 millimeters. When aiming with a 3x objective lens in this way, the 0.9 and 2.7 mm markings on the dividing plate are precisely pressed against the 0.3 and 0.9 mm markings on the measuring blade, and the cutting edge on the measuring blade is precisely aimed at the middle marking of the meter line. Mainly used for measuring the pitch diameter of threads.

3. Contact method: The contact method is a measurement method that uses the markings of a central microscope to aim and position the double engraved lines connected to the measuring head of an optical hole gauge attached to the measuring point, line, and surface of the measuring piece. When measuring, place the measuring head of the optical hole gauge tightly against the surface of the component (inner and outer). When measuring the aperture, first make the measuring head in contact with the inner hole of the measuring piece, obtain the maximum chord length, and then insert the middle engraved line of the meter line into the middle with the double set of lines of the optical hole measuring device, and read a number under the reading microscope; Then change the measurement direction so that the measuring head is in contact with the measuring piece on the other side, while keeping the middle engraved line of the meter line dividing plate still in the middle with the double set of lines of the optical hole measuring device, and read the other number on the reading microscope. The difference between two readings, plus the actual value of the probe diameter, is the internal dimension of the measuring piece. Subtracting the actual value of the probe diameter is the external dimension of the measuring piece.