Abstract: A microscope attached slide dotting device includes a clamping ring arranged for selective mounting onto a microscope barrel having an objective lens. The clamping ring includes cooperative first and second semi-cylindrical members arranged for clamping about the microscope barrel. The second semi-cylindrical member employs a mounting boss provided with opposed dovetail projections slidably and complementarily received within a slide plate. The slide plate includes opposed first plate flanges to receive the dovetail projections projecting from a first side of the slide plate, with a second side of the slide plate projecting at a dovetail boss for complementary and slidable reception within a housing recess of an associated marker housing. The marker housing includes a marker assembly extending through the marker housing. A plurality of clamping members permits orthogonal and slidable relationship of the marker housing relative to the clamping ring via slide plate.