The calibration device shall be set to zero before calibration is started.
校准设备应设置到零，校准开始前。
Aluminum metering chamber, thread connection. Mechanical readout device with rotating wheels. subtotals an be set to zero, total readouts can not.
带手轮的机械流量表，升数可以手动回零，总累不能回零。
Aluminum metering chamber, thread connection. Mechanical readout device with rotating wheels. subtotals an be set to zero, total readouts can not.
带手轮的机械流量表，升数可以手动回零，总累不能回零。
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