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| 型号 | YD—300A | YD—350A | YD—400A | YD—500A |
| 标距范围LO | 5~300MM | 10~350MM | 10~400。。 | 10~500MM |
| 等分点间距 | 5或10MM | 10MM | 10MM | |
| 适用试样规格 | 1~400MM | |||
| 标距精度 | ≤±0.5%(LO) | |||
