I have a 12K machine, its not a USRC but I roast 2lb batches on it for development as I don't have a sample roaster. The bean probe reads the temp, but its not exactly accurate, and the sampler is able to grab samples. So long as I take good notes it works out to find the right degree of roast. I adjust the airflow by looking at the beans, but cant hold the temp reading to airflow changes.