How close does the Sentry Xpress maintain temperature during a hold?

The normal temperature fluctuation during hold is plus or minus 2 degrees C. Ordinarily, the only time the temperature goes beyond the 2-degree fluctuation is after a fast rate, which causes a temperature overshoot. The overshoot usually stabilizes within 15 minutes. You can avoid temperature overshoot by programming a slower rate approximately 50 degrees F (27 degrees C) below the hold temperature.