The output signal of the invention can real-time respond the in situ soil salinity dynamic changes, no lag time, no measuring cumulative error;

To improve efficiency and veracity of soil sampling in testing bulk density, the cutting ring method and in situ soil tube method were combined and a multi-segment in situ soil sampler was designed.

Research shows that in-situ test methods reflect the engineering properties of the soil more objectively and serve the survey and design of the excavation engineering better.