| 摘要 |
PROBLEM TO BE SOLVED: To provide a space saving type long level. SOLUTION: An electronic level 3 is mounted on a folding rail 2 formed by combining three straight rails 4, 5, 6 in series with hinges. If folding rail 2 is linearly developed, the long level is formed, can be used for horizontality inspection over a long span, and also can be used in a folded state. The folding level is shortened about 1/3 of the developed size when folded, easy to transport, and a storage space can be saved.
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