Product review (5 stars): Perfect for monitoring freezers
We run a coffee shop, and have had a problem in the past with employees (and sometimes me) leaving the upright freezer door open.  Leaving that door open overnight can easily ruin hundreds of dollars of frozen product.  After the third incident, I knew we needed a solution.  We put an AcuRite outdoor sensor in each refrigeration unit.  I have the MyAcuRite app set to alert me when the temperature reaches a preset point.  This thing has already saved us far more than it cost.  Other reviews have complained about the delay in updating (it's definitely not a "real-time" reading online) but this actually is a feature for us.  I don't want to be alerted every time an employee simply opens the door for a few minutes to load the freezer.  I only want to be notified if the door is obviously open for an extended period (greater than 10 minutes.)  MyAcuRite also alerts me if the sensors lose connection, or need a new battery.  I don't have to wonder if they're working, I can trust it will alert me when there is a problem.