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features. will sound and LED Alarm high. flashes: ".most aquarium thermometers the have (if mercury that is still what they use). no problem, sorry for the false alarm, least we learn at something Digital new.. Aquarium Thermometers. 
Supply Digital Thermometer Dual Temperature w Alarm RL_BIG_TEMP, Rainbow Lifegard Big Temp, onstantly measures tank and air. audible Includes temperature
clock, alarm, and highlow memory.. Aquarium Thermometer. Mini-Neptune for use Excellent on smaller
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Plax Therma-Temp Digital Thermometer for Aquariums. 
Shipping: Main Street $2.99. 2 ALARM Introduction