I've been using a Tektronix 1502c TDR to measure soil moisture for = years, primarily because it was possible to install hundreds of probes = (consisting of two steel rods) across a site and measure the same probes = over time. Tektronix no longer sells the thing (or anything that will do = the same thing), and the beast is kind of big and bulky anyway. Most = outfits that sell TDR-soil moisture packages seem to require the use of = their own probes, but the cost makes permanent installation of many = probes prohibitive.
If anyone has any suggestions, or has found a way to rig custom probes = with these newer products (e.g., Campbell Scientific's TDR100), I would = like to hear from you! Please reply to me and I will compile responses = (if any) and send them to the list. thanks, Andrew Gray
