FIELD: measuring devices. SUBSTANCE: device has objective lens 2, vibration scanner 3, photodetector 5 which is connected to photo current amplifier 6 which is connected to Schmidt flip-flop 7 and indicator 8. Unit for automatic regulation of gain and unit for automatic stabilization of noise level are connected to photo current amplifier. Unit for automatic regulation of gain has non-linear element with peak detector 9 and transistor amplifier 10. Unit for automatic stabilization of noise level has peak detector 11 and amplifier 12. EFFECT: simplified design. 2 dwg
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