This 10x wide-field microscope eyepiece is compatible with microscopes with 30.5 mm eyepiece mount. The eyepiece is equipped with a micrometer scale, which is used to measure the preparations Features: DIN-WF 10x/30.5mm; Magnifications: 10x; Diameter: 30.5mm Compatible with the following Bresser microscopes: Biorit ICD (5802500); Researcher ICD Halogen (5803000); Researcher ICD LED/battery (5803100); Advance ICD (5804000); Biorit ICD CS (5802520)