This looks like the holding bracket for the external part of a weather station. The sensor clips into this bracket. Inside you would place the temperature screen module. These units display the inside and outside temperatures for you. Some units also show humidity, time and general weather conditions. Our unit has a little guy that strips down from a winter parka to a bathing suit as the temperature climbs.
2014 Flagstaff 27RLWS
Planned 10 year cottage (no Truck)
Prairie Sky Rv, Coaldale, Alberta