I use one on each side of both reptile habitats. They are MUCH more accurate than analog thermometers! I recommend you to buy digital thermometers instead of analog ones. I used to be one of those people who thought "analogue can't be exact" but it really is! They are great and for the price you can buy them! Update your temporary readers! Oh, and they come with a battery inside the device plus an extra battery as there were 12 batteries in the 6 pack! Each had 1 battery and a spare!
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