The thermometers that Woodstock sells are good. One came with our stove and we ordered a second one later. Those have been in use for 6 winters now and are very close. We check them against an IR gun occasionally and the most we've found one of them off was 20 degrees. We check them at various temperatures too. At 700 degree reading of the thermometer, we got 680 with the IR gun. That little bit we won't worry about. Most temperatures they either right on or off very little.