Aquarium Thermometer

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390388755986 0 Aquarium Thermometer
Waterproof LED USB Digital Temperature Thermometer Fish Inside Tank Aquarium B
US $12.99
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Nice Waterproof LED Digital Temperature Thermometer Fish Tank Aquarium B
US $14.49
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Waterproof LED Digital Green Temperature Thermometer Fish Tank Aquarium B
US $14.49
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Trendy Waterproof LED Digital Temperature Thermometer Fish Tank Aquarium B
US $14.49
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New Waterproof LED USB Digital Thermometer Fish Inside Tank Aquarium B
US $12.99
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Fish Tank Aquarium High performance Submersible LCD LED Digital Thermometer New
US $.43
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Lot of power heads filter parts strainers magnetic scrapers Aquarium parts
US $35.00
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18 X 8 22 WATT ADJUSTABLE HEAT PAD
US $25.00
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250990957857 0 Aquarium Thermometer
4 X 5 4 WATT ADJUSTABLE HEAT PAD
US $14.50
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Aqueon All Glass Deluxe Aquarium Kit 55 Gallon w Stand Fish Tank Power Filter
US $117.50
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330685962046 0 Aquarium Thermometer
Convenient Use Fish Tank Aquarium Submersible Hydrometer LCD Digital Thermometer
US $.09
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250991117188 0 Aquarium Thermometer
Digital Aquarium LCD Thermometer Fish Tank Meter with Probe C F FT
US $2.75
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270909967774 0 Aquarium Thermometer
Fish Tank Aquarium Marine Reef Temperature Thermometer
US $9.99
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180813049723 0 Aquarium Thermometer
LCD Fish Tank Thermometer Turtle Submerging Temperature Digital Aquarium Water
US $6.95
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130643773643 0 Aquarium Thermometer
VINTAGE METAFRAME STAINLESS STEEL THERMOMETER HOLDER
US $3.75
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VINTAGE NOT METAFRAMESTAINLESS STEEL THERMOMETER HOLDER
US $3.00
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270907816594 0 Aquarium Thermometer
65 gallon bowed front aquarium stand and all accessories
US $400.00
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270910069558 0 Aquarium Thermometer
Thermometer Fish Tank aquarium Temperature Measurement
US $10.49
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160733170189 0 Aquarium Thermometer
Aqueon QuietFlow 30 Power Filter Brand New For aquariums up to 30 Gallons
US $12.50
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270908252169 0 Aquarium Thermometer
Drawbridge Bridge Aquarium Ornament resin Decoration M
US $6.99
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Aquarium thermometers question?

Is it OK to only have a thermometer outside of the aquarium? How far off will it read?
Well, i just installed my heater last night, I have a regular house thermometer up against the tank that says it's 65, but the heater is turned up to 75! How can I make sure it's the right temperature in the water?

I think you mean those adhesive thermometers that attach to the outside glass of the aquarium.
My problem with them is that they measure the temperature of the glass, not of the water inside.
If you have a heater (or chiller) in the tank, the difference in these temperatures can be substantial.
However, they will give you a general idea if your water temperature is high or low, and they are easier to read than some of the floating thermometers.

I really like the small, battery-powered, digital thermometers that have come out in recent years. They give you the best of both worlds, because they have a temperature probe inside the tank, and a display of the temperature on the front of the tank.

Here's an ad for one of the electronic/digital ones (but there are also other models and brands):

http://www.petsolutions.com/Digital-Thermometer+I96300232+C1037.aspx

P.S.: Give your new heater some time to bring the water temperature up what you have it set for. If your water is still too cold after about three days, start turning up the heater in small increments, about one adjustment per day, until you get the temperature where you want it. The temperature on the heater dial may be different from that on your thermometer, for a number of reasons. The thermometer (one in the water, not outside the tank) is much more trustworthy.

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