CPC Subgroup
G01J 1/18 using comparison with a reference electric value
Full Title
Photometry, e.g. photographic exposure meter (spectrophotometry G01J3/00; specially adapted for radiation pyrometry G01J5/00 ) > by comparison with reference light or electric value > using electric radiation detectors (G01J1/20 takes precedence) > using comparison with a reference electric value
2 direct subcodes
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