Material: borosilicate glass from hydrolytic class I. 1.5H thickness (0.17 ±0.005 mm), specially for high-resolution precision instruments Absolutely colourless, completely clear, suitable for fluorescence microscopy Refractive index 1.524 to 1.527 at 546.07 nm Ideal for lenses with a high numeric aperture and high resolving power, e.g.: Dry lenses (air immersion): N.A. >0.7 Water immersion lenses: N.A. >1.0 Glycerine immersion lenses: N.A. >1.2 Oil immersion lenses: N.A. >1.3 Purpose: coverslips are accessories for in vitro diagnostic examinations in optical microscopy and are used to cover specimens for archiving purposes. Coverslips thickness 1.5H In vitro diagnostic medical device class A