Photometer accessories Description Pack of REF Special filters for photometers NANOCOLOR® 500 D / 400 D / 350 D / 300 D / 250 D Interference filter 412 ± 2 nm (incl. installation) for tube test Formaldehyde 10 1 919 841.2 Special filters for installation (wavelengths on request) 1 919 850 Special filters incl. ex factory installation (wavelengths on request) Read More »