CPC Subgroup
G01J 1/12 using wholly visual means (G01J1/20 takes precedence)
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 wholly visual means (G01J1/20 takes precedence)
2 direct subcodes
Child Classifications
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- G01J 1/14 using comparison with a surface of graded brightness,