This dual function thermometer features an ultra-fast probe for inserting into foods and taking internal temperatures with a response time of 1-3 seconds. Also takes an infra-red reading of external temperatures and produces a visible ring so that you can see exactly the area where you are reading the temperature. The further away you hold the meter, the larger the circle or area being checked. Reads temperatures from -76º F to +662º F. NSF Certified.