A microscope eyepiece micrometer is ideal for anyone wishing to take a measurement from an object that is being viewed under a microscope. This eyepiece is compatible with the Optika B292PLi Binocular Microscope. To fit simply remove the original eyepiece from your microscope which sometimes involves the loosening of a small screw on the eyepiece tube and replace with the eyepiece containing the micrometer. The eyepieces can be changed back if measurements are no longer required.Suitable for use with the following microscope:Optika B-292PLi Binocular microscope - B8R05565