FIELD: measuring technique.
SUBSTANCE: device comprises two-frequency light source, first and second light splitters, first and second light filters, first and second photodetectors optically connected with the light filters, first and second groups of comparators, decoder, logic circuit, first and second analogue switches, digital-analogue converter, inverting amplifier, analogue adder, indicator, unit for processing information, and light indicator of given values of spaces.
EFFECT: expanded functional capabilities.
3 dwg
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