A large display digital thermometer; displays both aquarium water temperature and room temperature. Great for use with aquariums, reptiles or greenhouses. You cannot see the temperature of water just by looking at it. Having a temperature display device on any tank is a worthwhile investment that can easily save you from disaster. By showing the room temperature and tank temperature in a single display, you can analyze how to react to adverse conditions. UPC: 788379307110 This item is new and unopened. I purchased several of them and no longer need this unit. Please see photos for more details and to assess the condition yourself. Also be sure and check out the other items I have for sale and message me if you want to combine orders. Thank You. For local pick up, this item is in North Huntington Beach (area code 92649). I can also meet along the 405 Freeway between Huntington Beach and LAX.