I wouldn’t call it a knockoff because it’s not pretending to be a Thermapen. It’s just a cheapie digital thermometer. For accuracy sake, I have the one below which costs $12. I put it in a glass of ice water and it took two seconds to reach a reading of 32.6F. I put it in a pot of boiling water and it took four seconds to reach 209.4F. I’d be surprised if I use it more than seven or eight times a year though. For $120, the Thermapen is probably sub one second and accurate to a tenth of a degree. I needed that kind of performance for some tests when I was working but not for cooking, particularly my cooking.