We bought this digital thermohydrometer on February 3rd and 7th for two separate tanks. Both stopped working this week. We reordered and attempted to replace the battery in one. One doesn't work at all and the second only works if you open the battery cover slightly. If you close the battery case completely, it won't work. The problem with leaving it open is moisture and eating away at the battery. Before he stopped working, he blinked and the numbers went out and then lit up. This battery should not be replaced every two months. There was no guarantee notice on the packaging. We can return those that don't work for a refund if that's acceptable to you.
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