FIELD: test technique. SUBSTANCE: device has perforated case 1 with different-thickness members 8 placed in case 1 perpendicular to it, magnetic sensor of medium penetration, and recorders 4 made in the form of mount with set of reed relays 5-7 designed for interaction with sensor. Magnetic sensor is built up of magnetic disk 9 and supporting disk 10 joined by rod 11. Different-thickness members 8 are placed between disks so that their thickness reduced from supporting disk 10 towards magnetic disk 9; disk 10 rests on least-thickness member 8. EFFECT: improved reliability of device. 1 dwg
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