This ocular micrometer fit for olympsu microscope. There are two crossed rulers inside the eyepiece micrometer. Each ruler is 10mm long and is divided into 100 cells. Each division is 0.1mm.
Material: optical glass, Diameter: 20.4mm
For this micrometer, MUHWA is available in different sizes of 19mm( please search for B07BF76L7X), 20.4mm and 24mm(please search for B083W4QDCR)