Ruler slides--there are two rulers inside the eyepiece micrometer,ocular micrometer Microscope eyepiece--the product is great for calibrating your microscope or microscope camera reticles,eyepiece micrometers Microscope calibration ruler--if the surface of the ruler is not clean, you can use the prepared cleaning fluid to gently clockwise from the inside to the outside, and it can be installed and used after it is air-dried,stage micrometer Slides area measuring ruler--in addition, it can also be used to check whether the technical parameters of the microscope you are using are accurate, such as the magnification and line of view,microscope micrometers Microscope micrometer--each ruler is 10mm long and is divided into 100 cells each division is 01mm,micrometer microscope