The thermometers built into the grill which is on the mounted to the top of the grill reads 100°F higher than a thermometer inside of the grill.
The thermometers built into the grill which is on the mounted to the top of the grill reads 100°F higher than a thermometer inside of the grill.
Could be calibration or hot air rising? Where are you putting the other thermometer in the grill? What happens if you stick them in boiling water?