I use a bucket heater to heat surrounding water around my degreasing bucket. I use an Inkbird ITC-306T to control the temperature. It has worked rather well for 4 months and now its getting way out of calibration. I have the calibration setting maxed out and it still says that 120 degree Fahrenheit water is 160 degrees. Including the calibration setting; it is 55 degrees off. I have been using it this way for a couple of weeks and just check the actual temp with a different thermostat and adjust accordingly. Seems to be getting a little worse every water change. Does anybody know a fix for this? Thanks.