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NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs I have done some moisture monitoring with Watermarks in the past and now have use of a Diviner 2000 from Sentek. I wish to be able to compare previous years data to current data. One problem I see off the bat is that the Watermarks read in centibars while the D2K reads in mm of water in a profile. I am curious how I might easily convert between the two without doing some gravimetric testing to establish the soil true capacity. Even then, without testing through many matric potentials to establish a proper curve, how could I be sure that each unit was responding to soil moisture in a similar fashion?? Tom Thomson Northwest Agricultural Consulting 1275 Oak Villa Road tomt@teleport.com Dallas, Oregon 97338 Phone/FAX 503-623-0468 "The only difference between a problem and a solution is that everyone understands the solution." Charles Kettering [Why not compare the two sensors directly in a test bed and allow it to dry across the range? Bruce]