Would be beautiful cleaned. This vintage Abbeon Inc M2A4 Relative Humidity and Temperature Indicator from West Germany is a valuable addition to any collection. The device was manufactured by Abbeon Cal, Inc. and features accurate readings for both temperature and humidity. It is a great tool for those in the medical and lab equipment industry, or for anyone who needs precise measurements. The Abbeon Inc M2A4 is made with quality materials and craftsmanship, ensuring durability and longevity. It is a unique piece of history that is sure to impress. Add it to your collection today.