Your pHin Smart Monitor will work with a pool or hot tub cover. Many pool/hot tub covers leave an approximately 3" gap between the cover and the surface of the water. If that is the case, our wifi bridge will still be able to receive the data pHin is monitoring.
If your cover is closer to the water than 3”, pHin will still work fine (even when submerged under water), you just may experience reduced range (i.e., distance it can reach to our wifi bridge or your phone) when the pHin is trying to communicate.
This means that you may need to walk near your pool every couple of days so the pHin Mobile App can connect with the monitor and "download" the data.