Accurate scale: the stick tube is marked with accurate scale that indicates the safe range for adjustment of stick tube. Do not scale out STOP when adjusting the length of stick tube.
精确标尺：管身表面有精确的标尺，标注管身调整的安全范围，调节管身长度时不能超stop标志。
Accurate scale: the stick tube is marked with accurate scale that indicates the safe range for adjustment of stick tube. Do not scale out STOP when adjusting the length of stick tube.
精确标尺：管身表面有精确的标尺，标注管身调整的安全范围，调节管身长度时不能超stop标志。
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