The flat head bolt located on the back will turn a little gear inside that moves the back face of the thermometer. Moving the back face of the thermometer will allow you to calibrate. Set up your water and ice bath (32F) Allow the thermometer to set in solution and come to equilibrium at what would be expected at 32F. If the thermometer is off of this 32F mark, make the adjustments via the screw to have dial point on 32F.
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