Vtg 70s DOW Calcium Chloride Pavement De-Icers Advertising Thermometer Sign 36. Vintage thermometer in good working condition and shows some surface rust on the mid to bottom area of the sign. Thermometer works and appears accurate.See all photos for condition and measurements. This item is in the category "Collectibles\Advertising\Merchandise & Memorabilia\Thermometers". The seller is "detroitsportsantiques" and is located in this country: US. This item can be shipped to United States.