A few years ago I designed and installed a Hanwell (UK Company; also in USA) radio telemetry environmental monitoring system in an historic building in Scotland. The system used 21 sensors including (1) T/RH, (2) Vis/UV and (3) wall moisture sensors that reported back to a base station via radio (5, 15 or 60 min report cycles). The base station software displays the location of the sensors and real-time conditions. Click on a sensor and get all the data (or just some) that has been recorded by the sensor: an hour, a day, a week, a few years or whatever has been gathered. If that seems of value to your needs, I can provide details. Timothy Vitale Paper & Photograph Conservator and Preservation Consultant Aptos & Felton CA 408-684-2731 office 408-335-2541 studio