Cooper-Atkins' panel meters allow you to obtain accurate interior temperature readings remotely from outside the cabinet. 

They reduce the frequency of opening your cooler / freezer door and keep the cold air in and the hot air out. All are designed for retro-fit applications.

Cooper-Atkins DM120S-0-3 Digital Panel Thermometer with 2" Back Flange, -40°F to 120°F Temperature Range - (REPLACEMENT DM120-0-3)