We offer a selected range of micrometer scales for the most popular applications in light microscopy. The reticles have surface patterns; sandwiched types are available at considerably greater cost. **Please make sure you check your eyepiece measurements prior to ordering. Each pair is proportional to its adjacent pair, smallest pair = 0.1mm. 10 pairs of gauge lines in a 10mm image area, annotated 1, 2, 4, 6, 8, 10, 12, 16, 20, 25. Note: Stage micrometers can be purchased certified, but not reticles. The area or length they 'see' would differ with the microscope and its configuration. So the readings are comparative unless used in conjunction with or calibrated using a stage micrometer. The comparative values can be entirely accurate.