Test your ovens calibration without using tools!

If you suspect that your oven is cooking hotter than the temperature you set it at.  (Your Thanksgiving rolls burned)  Try this easy way out:

             Pour a spoon full of sugar in a oven-safe bowl or use some foil into a 350 degree
             oven,  After an hour the sugar should still be granulated(might turn a little brown).
            If it started to melt your oven is running too hot!