Vintage 1950s Dun-Lap Grain Bin and Soil Thermometers, metal, model 19, patent number 175539 patented 3/28/1876, with mounts but no boxes, still work well.  Used for grain bins and as soil testers for planting.  Made of high strength aluminum, these thermometers are in great shape.  Measures temps from -60F to 140F.  With mount, dementions are 9.75" X 3" X .75".  Advertising stamp on back reads "Federal Land Bank Association, Farm & Ranch Loans".  Comes with directions and date/temp record.  Nice pieces of yesteryear for the farmer of today.