I use this thermometer for my aquarium. It has been unusually cold so I wanted to check if the heater could keep up with the cold at night. It records the min/max temp for a 24 hour period starting and ending at midnight, and it resets daily. The main temp has one decimal point, for instance 74.8. The min max only has whole numbers. The picture of the sticker of the thermometer is not correct. It only says in or out next to the main display, it does not show in or out next to the min/max display. When you push the top button, it toggles between in or out temp (both the main display and the min/max). I don't like the button battery, I would have preferred a AAA battery. I don't know how long the battery will last.For the probe that inserts into the water, I put a small piece of plant lead weight on it to give it more weight to sink. To keep the wire straight in the water, I cut a small piece of plastic straw and slip it over the wire.
Rating: [5 of 5 Stars!]