We offer many different types of swimming pool, hot tub, and spa thermometers, including floating and mounted models. As their name suggests, floating thermometers float on the pool or spa’s surface, and measure the water temperature with sensors inside of the unit. They are very affordable and are available in the design of either traditional thermometers or in fun styles featuring rubber duckies that kids (and grown-up kids!) love. The downside of floating pool and spa thermometers is that they can be slightly less accurate than mounted thermometers, since they are not completely submerged in the water and therefore will pick up part of their reading from the surrounding air. Many people, however, find floating thermometers perfectly accurate for their purposes, which is why we sell a variety of high-equality, cost-effective floating models here at Pool Parts Unlimited — your pool superstore.