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Title: You get what you pay for here
Review: I used this with a 10 gallon tank. I had the thermometer set to 79 degrees. I had this thing on the side right next to the heater. It showed 70 degrees when I had the heater on 79 degrees. I moved the heater up to 82 degrees and this thing said 74 degrees. I don't know what was wrong but I didn't think this thing worked so I sent it back.
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