This is a precise stage micrometer that is used to calibrate your microscope or microscope camera for precise measurement. It comes with 1mm total length that is subdivided into 100 divisions. That is, each division is 0.01mm. Features & Specifications : Precision Stage Micrometer for Calibrating Microscopes or Microscope Cameras Slide size: 25mm x 75mm X ruler 1mm/100 1 Div. = 0.01mm 1mm Total Length Subdivided into 100 Divisions Each Division is 0.01mm Across Brightly Illuminated Grid Lines Precision Ground Glass Slide Please call for the availability of English Mills units (1/1000¡±)