Adolf Thies, "Hygrometer- Psychrometer" ,Gottingen - Geismar, c. 1965. Brand new, made with excellent materials (nickel, glass, leather, plastic, wood, steel). The psychrometer is composed of two thermometers mounted on a metallic connection made of a central tube. This tube divides into two lower branches to protect the thermometer tanks. Comes in original oak wooden box, 43x13x13,5 cm, weight around 2 kg. Complete with all accessories. Never used.