SWZ型周记水位计
记录时间：8天
浮筒直径：200mm
水位变幅：10m
误    差：≤±1cm
用    途：用于自动记录江河、湖泊、水库涵闸及潮汐的水位变化过程，每周换纸一卷. 
Running time: 8 days
Diameter of float: 200mm
Stage fluctuation: 10m
Error: ≤±1cm
Application: It is used for long term automatically records of the water level change process of the river、 lake、  reservoir and etc.