It works..
My chest type freezer went out some time ago and I accidentally discovered it in time before my meat went bad.<br />Since then I decided to try one of these to alert me to a problem..  Also I can just look at the digital display and see the temperature inside without lifting the door..  The warning alarm is not too loud but loud enough that you will notice..<br />It has twin magnets that hold it in place on the outside of the freezer..
Rating: 5 stars