WL 362 Thermal Radiation Unit / PC
1 support,  2 measuring amplifier,  3 absorption plate with temperature measuring point,  4 colour filters (red, green, infrared),  5 aperture,  6 rotating light source,  7 holder for colour filter / aperture,  8 holder for absorption plate,  9 luxmeter,  10 thermopile,  11 thermal radiator