Your reading should be 100% saturation in the moist storage chamber, Be sure you do not have an air pockect under the membrane. 59F water at sea level would show 100% stauration at a reading of 10.1,// 72F would be 8.7 and 86F would be 7.5 If you maintain 70% plus saturation in water above 70F you should be fine in your "neck of the woods"Your readings without aeration will flucuate more on a daily basis than with aeration.