Instruct: Classify Amazon reviews into positive or negative sentiment
Query: terrible...not calibrated

Bought 2 of these, both extremely uncalibrated. Showing 30-35 degrees higher than the actualinternal temperatures of meats. After 1/2 hour for a three pound roast at 325 degrees in oven,both thermometers showed 140 degrees (ready). Actual internal temp measured with an external quickthermometer was 75 degrees.