The question needs more precisions to get a correct answer : "soil" should be defined more accurately in size (dimensions, volumes etc ...) and durations of measurements ...

Basically for conductivity measurements you need a voltage source and an amperemeter. But these instruments vary much in size and costs depending of what exactly you usant to do !

I agree with Mr Grosmann in his assessment.

That been said, you might be able to use the sensors from the irrometer company.

irrometer.com

Sorry for the trouble with my half question.

I wanted to check a few spot soil salinity values in my study area (paddy cultivated land). Depth is 10cm level. Then I am willing to check that with SSI which create through Sentinel or Landsat satellite image.

So for that.. is there any soil salinity meter that I can rely on ?

How about JXCT sensors?

If u have an idea please enlighten me regarding this matter.

Thank you!