RE: Another covering question
That won't be a problem. It's what we use to calibrate the irons to shrink the fabric on full scale restorations. Take a stack of paper towels about 1/2 inch thick and place the thermometer on it. Then, place the iron it and crank it up. We usually look for two marks, one at 250F and another at 350F. These are the two temps we look for with the Stits fabric. The candy thermometers are much more durable than the thermometers we used to get from the factory at Poly Fiber. I don't think you will hurt it.