FIELD: measuring equipment. SUBSTANCE: device comprises lens 11 with mask 2 installed in its plane of image and provided with two apertures accommodating selective optical filters 3, 4, 5, vibrator 6 with photodetector 7, photocurrent amplifier 11, automatic amplification adjustment unit 12, two switching devices 13 and 14, Schmitt flip-flop 15, low-frequency filter 16, thermocompensation unit 17, adder 18, indication unit 19 and oscillograph 23. EFFECT: possibility of measuring deviations from preset nominal and shape in various longitudinal sections. 3 dwg
