Review on ETHMEAS Digital Refrigerator Thermometer - Easy-to-Read Fridge Thermometer with Large LCD Display, High/Low Temperature Memory & Alarm Function by Patrick Freddie

Easy to use and seems accurate. The probe has a round wire that goes through the door seal, but I don't notice any cold air leaks from the freezer. I recommend placing the sensor on the back to avoid overheating alarms when you open the door for a minute. **UPDATE** My freezer broke while I was out and the alarm rang before I got home a few hours later. The next day I found that the frozen food was melting. This is actually a useless product as the alarm stops after a while and you may not notice the error for several days. It's not 5 stars anymore.