From the sample information that Bert sent me I have come up with this list of sensors used by RFXCOM.
Digimax Thermostat
Oregon Temp - THR128/138, THC138
Oregon Temp - THC238/268,THN132,THWR288,THRN122,THN122,AW129/131
Oregon Temp - THWR800
Oregon Temp - RTHN318
Oregon Temp/Humidity - THGN122/123,/THGN132,THGR122/228/238/268
Oregon Temp/Humidity - THGR810
Oregon Temp/Humidity - RTGR328
Oregon Temp/Humidity - THGR328
Oregon Temp/Humidity - WTGR800
Oregon Temp/Humidity - THGR918,THGRN228,THGN500
Oregon Temp/Humidity/Baro - BTHR918
Oregon Temp/Humidity/Baro - BTHR918N, BTHR968
Oregon Rain - RGR126/682/918/928
Oregon Rain - PCR800
Oregon Wind - WTGR800
Oregon Wind - WGR800
Oregon Wind - STR918, WGR918
Oregon UV - UVN128, UV138
Oregon UV - UVN800
Digimax Thermostat
Oregon Temp - THR128/138, THC138
Oregon Temp - THC238/268,THN132,THWR288,THRN122,THN122,AW129/131
Oregon Temp - THWR800
Oregon Temp - RTHN318
Oregon Temp/Humidity - THGN122/123,/THGN132,THGR122/228/238/268
Oregon Temp/Humidity - THGR810
Oregon Temp/Humidity - RTGR328
Oregon Temp/Humidity - THGR328
Oregon Temp/Humidity - WTGR800
Oregon Temp/Humidity - THGR918,THGRN228,THGN500
Oregon Temp/Humidity/Baro - BTHR918
Oregon Temp/Humidity/Baro - BTHR918N, BTHR968
Oregon Rain - RGR126/682/918/928
Oregon Rain - PCR800
Oregon Wind - WTGR800
Oregon Wind - WGR800
Oregon Wind - STR918, WGR918
Oregon UV - UVN128, UV138
Oregon UV - UVN800
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