刻度长度：40cm、60cm
误 差：≤±0.18mm(40cm); ≤±0.27mm(60cm)
用 途：水工模型测定水位用.
Graduation length: 40cm、60cm
Error: ≤±0.18mm(40cm); ≤±0.27(60cm)
Application: It is used for measurements of the water level on hydraulic models of testing tanks.