Photometer for determining extinction or transmission of a trial item has a light source and flow-measuring line to pass light to a measuring photo-receiver through a trial item and through a filter to determine test wavelengths.

摘要

A photometer (1) has a light source and flow-measuring line (4) for feeding light to a measuring photo-receiver (18) from the light source through a trial item and through a filter (14) to determine test wavelengths. A reference line allows light from the light source to be fed to a reference photo-receiver through a reference filter to determine reference wavelength.