FIELD: measurement technology. SUBSTANCE: meter has long part 1 carrying light emitting facilities 6 and light- detecting ones 7. Mentioned end is surrounded by flexibly displaced enclosure 8 which detects light-tight space when long part 1 is applied to surface for taking readings. Emitter and detector are placed in definite positions relative to surface under measurement in which light screening mechanism is ensured. EFFECT: reduced size of meter. 8 cl, 4 dwg
