FIELD: geophysical testing. SUBSTANCE: caliper has active element 1, flexible envelope 5 and device for fixing flexible envelope. The latter is made in form of two jaws 6 provided with posts 8. Liquid is advanced into envelope through branch pipe 10 and point 9. Active element is acoustically decoupled away from hollow support. EFFECT: improved precision of determination of condition and properties of rocks. 3 cl, 1 dwg
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