Microscope Stage Calibration Slide, Dual Axis Cross Line Target 1mm/100/0.01mm, Linear Scale Micrometer Ruler 50mm/500/0.1mm | Boli Optics Microscope Store
Measuring with the microscope
KOPPACE Measuring Microscope Calibration Ruler 0.01mm-0.1mm Special Calibration Ruler for Microscope Measurement