I need your help please

We are off cruising now for the next two years. Projects on my boat have started to come to an end. I'm hoping that some of you out there will contribute some of your projects to me to post here. My email address is in the header and that is the best way while out at sea.  I look forward to hearing from you and your boat project that show's your skill, thoughts, ingenuity, and generally just makes life simpler  while on board. Catch you later after a 12 day passage.

Fridge and Freezer Temperature Monitoring

We have recently changed our method (compressors and evaporator plates)  to our fridge and freezer. We wanted a reliable method to monitor the temperatures with out extra wiring. We have tried the manual thermometer, but found them less than satisfactory due to having to open up the boxes to read the temperature. We came across these wireless "indoor, outdoor temperature monitors" on ebay for a reasonable cost. This model has one LED monitor, with two sender units. It is able to monitor two temperatures at a time. We put one sensor in each box, and the LED monitor in the galley in a convenient place. They have been going two years with only one battery change. They measure about 2.75 inches square each.