These temperature sensors are accurate to +-.5 degrees. I am very happy with it. My only problem was getting them to stick together. It takes 2 or 3 times before they finally stick. After that they seem to hold up. A similar problem with the suction cup in the tank. That's no reason not to buy them. Just check the suction power to make sure the active fish aren't knocking over the probe. I am very happy with this purchase
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