Check the listing for details. VINTAGE FLOATING DAIRY THERMOMETER WITH CASE. Listed at 17.89 USD. The Vintage Floating Dairy Thermometer with Case is a unique and collectible scientific instrument from the 1930s. This thermometer, specifically designed for use in dairy settings, features a floating scale that allows for accurate temperature readings. The antique design and functionality make it a valuable piece for collectors of vintage scientific instruments or those interested in the history of dairy farming. The thermometer comes with its original case, adding to its charming appeal and preserving its vintage charm.