Choosing the right Comark refrigerator thermometer for a home or commercial kitchen means more than just keeping food fresh. You need to know that at all times, your walk-in refrigerator or reach-in freezer is at a safe temperature for holding food. These top-of-the-line thermometers from Comark feature color coding for temperature zones so with one glance, you can see that your freezer or refrigerator is at a safe temperature, or may need some immediate attention.