儀器使用簡單，易操作
兩體式，體積小，重量輕和容量大，在測試過程中不會產生其它傳播波
多種型號，測試頻率為0.1/0.05/0.02Hz
The instrument is simple to use and easy to operate
Two-body, small size, light weight and large capacity, no other propagation waves during the test
A variety of models, the test frequency of 0.1 / 0.05 / 0.02Hz
