Accu-rites specs are that they're accurate to ± 2 F. So if it reads 99, it could be anywhere from 97 and 101. That's if they meet the specs. Most thermometers I've seen can be much farther than that, even ones I bought from incubator companies.
The thermoworks one is accurate to ±0.9°F and it can be calibrated to tighter range.
The thermoworks one is accurate to ±0.9°F and it can be calibrated to tighter range.