대학 요록在20℃的温度下，将管子弯成U形，然后固定一端，另一端逐渐向固定端移动。 测量线管折叠处的直径。
| Symbol | Color (1) | Symbol | Length (2) |
| B | Black | 20 10 | 20 m 100m (Black and blue only) |
| W | White | ||
| R | Red | ||
| BU | Green | ||
| Y | Yellow | ||
| G | Green | ||
| N | Transparent | ||
| YB | Yellow |
| Symbol | Color (1) | Symbol | Length (2) |
| B | Black | 20 10 | 20 m 100m (Black and blue only) |
| W | White | ||
| R | Red | ||
| BU | Green | ||
| Y | Yellow | ||
| G | Green | ||
| N | Transparent | ||
| YB | Yellow |
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