We purchased this great working unit from a Restaurant that went out of business.We were told it was working perfectly. We even put it in a 5Qt tank and ran it(you can see the circulator pumping the water around). It went from 75 degrees to 145.5 in about less than 10 minutes. Yes, it has a little a heat stain on front Lens, but that  doesn't effect it performance at all, you can still see the LED screen fine. A friend brought over some vacuum sealed chicken and cooked it. Wow, that worked great. There was a scuff on the ground wire so our in-house electrician inspected it and decided just a good job with electrical tape was all it needed. We are keeping the price low because of the Heat Stain on the lens. Remember, that doesn't hurt it's function at all. You can watch many YouTube videos on how to change from Ferenheight to Celcius or Change other settings. We do accept returns but buyer is resposible for shipping costs. This isn't show-and-tell at our expence.