Glass Filter Set Type 666-S000 photometric accuracy (ND Glass)/waveLength accuracy (Holmium)

Glass filter set type 666-S000 for checking photometric accuracy (neutral density glasses) and wavelength accuracy (Holmium glass), set consisting of: F0, F1, F2, F3, F4, one reference filter (F0), 3 neutral density glass filters (F2, F3, F4) with the absorptions: 0.25 / 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