Lab-line Barnstead Pyro-Magnestir stirrer hotplate stirring hot plate heating

used Lab-line Pyro-Magnestir stirring hot plate. Aluminium plate 6x6 inches. 115v. 500W. The stirring regulator works good. the heating regulator works only for low to medium heat and stop working for high heat. It takes approximately 20 minutes at medium heat to boil 0.5 liter of water. If not satisfied. You can return this unit within 30 days for a full refund minus shipping. Lot con3/3