Preheat your oven to 250 degrees
Remove ham from all it's packaging and place on a roasting pan with rack. If you don't have one you can use a half sheet pan.
Insert the probe of a thermometer on an angle from the side into the deepest part of the ham without hitting any bone.
Cover the ham in heavy duty aluminum foil.
Place in the oven. Attach the probe cord to the unit. Set the alarm to go off at 130 degrees. Should take around 4 hours.
If applying a glaze, remove the ham from the oven at 130 degrees. Increase the heat to 400 degrees to help the glaze set fast.
Brush the glaze all over the surface of the ham. Return to oven and cook until you hit 140 degrees.
Remove ham from oven. Allow to rest for about 15-20 minutes before carving.