I may be wrong but believe the Fine Offset co. produces these and many other companies sell them under their names.
Compare products such as Fine Offset Electronics: WH-1080, WH-1081 (also known as Watson W-8681,
WX-2008, National Geographic 265 NE, Elecsa 6975/ 6976, Ambient Weather, Weatherwise WS-1080/WS-1090/WS-2080,
Tycon TP1080WC, Zephyr, Maplin, Froggit).
edit: Welcome to the forum!