Selenium photoelectric elements - General dimensions
€16.45
Round selenium photoelectric elements - External dimensions
€24.39
Sockets for round selenium photoelectric elements
Optical signals in traffic - Colours and colour limits for signal lights in railway traffic
Colours and colour boundaries of signal lights - Stationary signal lights in local public transport
Photometric evaluation of projectors
€41.78
Determination of iodine colour number
Colorimetry - Measuring conditions for object colours
Optical signals in traffic - Colours and colour limits for signal lights; general rules
Colours of light signals
€269.00
Photo electric exposure meters
Photoelectric type portable photometers
Photometric integrators
