The Dinosaur Electronics Dometic Thermistor Adjuster is for Refrigerators which are classified as "Fixed" or "Automatic" Temperature, and are not always set to every customers satisfaction. The Variable Thermistor Adjuster, which is connected in series between the "thermistor" and the "control board" allows the user to adjust the temperature from "slightly" colder to "much" colder. Of course this assumes that the rest of the refrigerator is functioning properly. Only for "fixed" temperature refrigerators, that are not getting sufficiently COLD.
Dinosaur Dometic Thermistor Adjuster