Precision coverslips, Ø 30 mm, Borosilicate glass, 0.17 ± 0.005 mm, 1000 unit(s)Precision coverslips, 30 mm, Borosilicate glass, 0. 17 0. 005 mm 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