Best probe Thermometer for flue pipes. Durable genuine porcelain enamel with yellow and orange zones clearly indicated on brown case- shows temperatures in the center of the flue pipe, at a glance. Stem length 4 inches, engineered to measure accurately, for any diameter flue pipe up to 8". 

Requires ¼" hole. Mounts easily with included magnet and eyelet

Reading up to 1700° F

Rugged Steel Case

Measurements:  4" x 2"