Lifegard's Thermometer Could Save Your Saltwater Tank From Disaster! Don't Just Guess Your Temp
The Lifegard Thermometer and Hygrometer combo is a great tool for any reef tank owner. You get a nice large LCD display to get your measurements at a glance and built alarms can be set to notify you with an audible alarm when measurements fall out of range. This way you can make the necessary moves to save your tank before a temperature related catastrophe.