Glass Filter Set 666-S005

Glass filter set type 666-S005 for checking photometric accuracy (neutral density glasses) and wavelength accuracy (Holmium glass), set consisting of: F0, F1, F3, F4; one reference filter (F0), 2 neutral density glass filters (F3, F4) with the absorptions: 0.5 / 1.0 certified at wavelengths: 440; 465; 546.1; 590; 635 nm and one Holmium glass filter (F1) certified at wavelengths: 279; 361; 453; 536; 638 nm, in high quality storage box with DAkkS calibration certificate