FIELD: measurement technology. SUBSTANCE: gear has ultrasound transmitter and receiver converting received signal to electric one, threshold switch coupled through analog-to-digital converter to microcomputer that measures time interval between emitted and received signals and interval between specified excesses of threshold values by echo signal. Threshold of threshold switch is set depending on interval between specified excesses. In other versions of gear there is inserted amplifier with variable amplification factor which is connected with output to threshold switch. amplification factor is adjusted by microcomputer directly or by action on start-stop electronic unit connected to mentioned amplifier. EFFECT: increased functional reliability of gear. 9 cl, 10 dwg
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