Same logic, however most will add a temperture element to the probe for compensation. I believe that normal units for resistivity in liquids is ohms/cm, at least that is a specification we have to test for when we are checking the deionized cooling water in a large variable speed drive system I support. The probe is just two wires spaced one cm apart and the we have to meet a spec of one megohm per cm or better. We use a omega conductivity meter that reads out in conductivity units or resistance units.
Here is the unit we use to measure out DI water resistivity:
**broken link removed**