| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a spirit level that exerts, when it is to be fixed by adsorption onto a measurement object having a concavely curved external surface such as a pipe, sufficient adsorptive force for such adsorptive fixing without needing manual holding.SOLUTION: A spirit level is so configured that, by cutting into a measurement reference face 1 a V-sectioned concave groove 15 having a length in the lengthwise direction of the measurement reference face 1, part of the circumferential face of a measurement object is snapped into the V-sectioned concave groove 15 when the measurement reference face 1 is brought into contact with the measurement object, and left and right edges 15A of the V-sectioned concave groove 15 come into contact with the measurement object and are adsorbed and fixed by a magnet part 5. The tip of the magnet part 5 is configured to be positioned along the edges 15A of the V-sectioned concave groove 15, and the side end of the tip of the magnet part 5 is so chamfered as to match the inclination of the V-sectioned concave groove 15.</p> |
