Use for aquariums reptiles green houses. Displays both aquarium water temperature and room temperature in F. Safe for salt or freshwater use. Four alert features. Alarm will sound and LED flashes. 1. High temp alert only (probe). 2. Low temp alert Only (probe). 3. Both high and low temp alert (air / room). 4. Both high and low temp alert (probe). Wide temperature range - 58 F to + 158 F. 3' cord with all plastic probe and suction cup.