We just received this low cost Digital Thermometer with a thermocouple wire probe, a simple and effective way to monitor temperatures in a roaster … especially when snaking a flexible wire into the roast chamber is easier than drilling holes for a rigid thermometer shaft. It is also perfect for chocolate tempering. I have checked the calibration on half a dozen of these, and all have been either right on (at boiling and freezing) or no more than on degree off. And the temperature range on this thing is amazing: -58 f to +1382 f ! It comes ready to go with a K-type thermocouple and a 9v battery installed. You have a choice of Centigrade or Fahrenheit readout on the big easy-to-see LED screen, and a Hold button in case you want to freeze the readout screen at a particular moment (not sure why you would want to. With a pen, paper and a watch, you can create roast curve charts and graphs the old fashioned way!