Meteorological instruments, thermometer 280 for psychrometer Instruments météorologiques, psychromèfre-thermomèfre 280The 280 thermometers used in Assmann psychrometers are used to determine air and wet temperatures. They come in pairs
DIN 58661:1966 history
1966DIN 58661:1966 Meteorological instruments - Thermometer 280 for psychrometer