Turned on the device and the screen just flickered on and off and bounce between C and F and then I thought that I had it working for a second, but after 2 minutes of it stuck in the chicken breast, it told me that the temperature was almost 200 degrees. The temp just kept climbing slowly, so I just stopped trying. Went back to my old thermometer and it told me I was at 140. I wanted something that would be quicker but this is not it. Very cheap product. You get what you pay for, I guess.