JR 折疊間尺 30cm（新幹線 N700S）
Approved by JR Central, A convenient folding ruler for the Shinkansen. Folded Ruler Length 15cm, but becomes 30cm ruler when unfolded and the train are connected. It has a protractor that clicks every 15 degrees and can measure angles.
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Specifications
| Brand | 駅鉄 |
| Country of Origins | China |
| Manufacturer | Risseisha |