I believe it's going to refresh itself as the temperature changes. That's what mine does. Then again, I have a variable speed pump that runs 24/7 (most of the time at a very low speed) so mine is always accurate. If you're worried about having it accurate at all times, try to locate the sensor somewhere that you can drop it down into the pool itself. I have a line that comes up from my bottom drains that's designed to break suction if something blocks them. I could have dropped it in the water there had I wanted to. Get creative if you can!!!