The document summarizes an experiment comparing an energy harvesting passive temperature sensor card to a Fluke thermometer. The experiment involved placing the sensors in different locations in a refrigerator over multiple trials and recording the temperature readings every five minutes. The passive temperature sensor closely matched the Fluke device while cooling down in the refrigerator, though it lagged by 0.3 degrees Celsius and took 5 minutes to stabilize after removal. The preliminary results indicate the passive sensor can provide stable temperature readings using only harvested energy and measure temperature accurately within 1 degree Celsius.