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Cheap Digital Aquarium Thermometers
Tales from the cheap:
A digital thermometer with probe wire can be had for $6-$12. Sold as a
Indoor/Outdoor Thermometer (made in China), it reads the air
temperature on the top display and the probe temp. on the bottom. My
sensor is anchored at the bottom of the tank. I take the little magnet
out of the probe end to avoid rust.
I have bought 5 of these over the last three years and never had a
problem - takes AAA batteries.