The Marienfeld Microscope Cover Glass (22x60 mm) is a premium, high-precision laboratory consumable designed to anchor specimens perfectly flat against microscope slides. Engineered from chemically resistant borosilicate glass D 263® M (first hydrolytic class), these rectangular coverslips offer unmatched clarity and optical performance. With a strict Thickness No. 1.5 specification (0.16 to 0.19 mm), they are explicitly optimized to match modern microscope objectives, preventing imaging defects and spherical aberrations.