Pool thermometers come in all types, shapes, and sizes as well as varying price ranges. The price ranges anywhere from $1.99 to $99.99 depending on how much you wish to spend and what type you are searching for. You can find them at Target, Sears, Amazon, and also, online at sites such as Sharper Image.
Some of the types of thermometers are floating thermometers such as the Ace Pool Thermometer which you can purchase for $4.39 at Amazon.com. There is the digital floating thermometer for $12.99 at Sears. You can also go with a cute thermometer such as the Derby Duck or the Turbo Turtle.
The Derby Duck has a duck on top of it that resembles a bath toy, which is made of plastic, and adds fun to your swimming pool. It features Fahrenheit and Celsius readings. It is used along with the Derby Duck Chlorinator, which is sold separately. You can find this one at Target for $9.99. Also, at Target, you can find the Heritage Floating Dial Thermometer for $10.99 with a large dial that is easy to read.
How about one that you can monitor from the comfort of your home? There are many types of thermometers, such as the wireless, that comes with a remote for around $99.99. You can control your pool (or hot tub) with it and the remote will alert you when the temperature is too high or too low. One model, in particular, you can get at Sharper Image which will monitor from indoors up to 328 ft. away. You can switch the display to show the temperature in English or metric; and, it also has the capability of setting an alarm to let you know when the water goes past your selected temperature.
A pool thermometer can be very helpful in that you will know when the water temperature is just right for swimming. In temperatures below 32 degrees Fahrenheit, you must remove the wireless thermometers to keep them from freezing. Likewise, you must also remove them when the temperature goes above 158 degrees Fahrenheit. Under various conditions, the wireless thermometers can be blocked by interference due to certain conditions.
The most important thing to know when searching for your thermometer is to determine your individual needs and how much you wish to spend on it. Do you want one that is easy to read, cute and fun to have in your pool, or convenient and pricey such as the wireless? Once you figure out what you want, search online to buy it.