7 Best Pool Thermometers of 2021 Compared & Reviewed

Best Pool Thermometer
Photo: Aquatix Pro

There is a lot of importance in ensuring that you keep monitoring the temperatures of your pool but mainly because you should ensure that the water is warm or cool enough for your users to comfortably swim.

For this to happen, you need to invest in the best pool thermometer to ensure that the product gives you accurate temperature readings. Moreover, the thermometer should be long-lasting and its costs of operation should be minimized.

In case you are searching for a reliable and accurate pool thermometer, here are 7 pool thermometers that you can choose from.

What To Check Before Buying Best Pool Thermometers?

How to Buy the Best Pool Thermometer
Photo: eLander

1. Digital or Analog Pool Thermometer

Pool thermometers are available as either analog or digital and each one of them has advantages and disadvantages. Here is an overview of each:

Digital Pool Thermometers

This is a pool thermometer that uses a sensing probe which you submerge in water, for to communicate the temperature reading on the display. In the modern-day, digital pool thermometers feature a wireless design because they have two separate devices.

They have a receiver and a sensor and the sensor is the part that remains in the water to communicate temperature information to the receiver wirelessly. The receiver, on the other hand, is the part that receives data from the sensor and there is a distance limit for this to happen.


  • Convenient
  • Fast
  • Accurate


  • Relatively expensive
  • Requires source of power to operate

Analog Pool Thermometers

These ones behave and look like traditional thermometers, where their display is a thin glass or plastic strip with alcohol or mercury rising to show the particular temperature in the pool.

While these models are long-lasting and cheaper, they may not always be accurate. Additionally, these pool thermometers are unable to leverage wireless technology.


  • Cheaper
  • Durable
  • Easy to read and maintain
  • Works without any source of power


  • Slower
  • Can be inaccurate

2. Styles

Pool thermometers feature different styles including hand-held, floating or hanging. Here is an overview of each one of them.


These are pool thermometers that sit on the surface of pool water. Since they are not fully submerged in water, these models can be less accurate but not always.


Just like the name suggests, these are pool thermometers that hang inside the pool water. In most cases, they are usually tied with a string to the wall of the pool and allowed to be a few inches inside the water.


Handheld pool thermometers are temporarily placed in water until a [precise reading is achieved. Alternatively, these models feature a ‘point and shoot’ infrared laser to help them rely on the temperature readings.

3. Display

A pool thermometer will not be of much help if you are struggling to read the temperature. This is determined by the display of the thermometer and this is why this is a critical point of consideration when buying one.

Some models have backlit displays to help you tread the pool temperatures at night while others have varying sizes. In case you have vision problems, buy a pool thermometer that features a large display, large numbers, and brighter backlighting.

4. Accuracy

This is a major point that you must keep in mind when buying a pool thermometer. You have no business buying a product that gives inaccurate temperature readings.

Therefore, always make sure that you buy the best high-quality unit you can afford and check online reviews to know whether it is accurate.

5. Battery

Analog thermometers do not require batteries, but digital models need some form of power source. Some digital pool thermometers are powered by batteries that are replaceable. This means that there is an extra cost of maintenance or operation that you should keep in mind.

If you feel that you do not want to cater to battery costs every once in a while, it is best if you consider buying solar-powered pool thermometers. However, if you do not mind operating with batteries, make a point of knowing what type of battery your thermometer uses.

7 Best Pool Thermometers of 2021 Reviewed




Pool Central Pool Thermometer

1. Pool Central Pool Thermometer (Best Overall)

  • Top rated pool thermometer 
  • Goldfish at the top
  • Easy to read display
  • Long lasting nylon cord
Dartphew Swimming Pool Pool Thermometer

2. Dartphew Swimming Pool Pool Thermometer (Best Budget)

  • Budget-friendly pool thermometer 
  • Quality guarantee – 1 year warranty
  • Easy to use
  • Environmentally friendly
Milliard Pool Thermometer

3. Milliard Pool Thermometer (Best Versatile)

  • Versatile design
  • Analog scale
  • ABS plastic material
  • Waterproof design
Aquatix Pro Pool Thermometer

4. Aquatix Pro Pool Thermometer (Best Durable)

  • Durable pool thermometer
  • Large size pool thermometer
  • Precise and accurate readings
  • Wide compatibility
River Country rc-pt1

5. River Country rc-pt1 (Best Easy to Read)

  • Easy to read display
  • Tie off tether string
  • Impact resistant plastic material
  • Versatile design
Milliard Pool Thermometer 6

6. Milliard Pool Thermometer (Best for Indoor & Outdoor)

  • Indoor and outdoor use
  • Easy to read display
  • 1.5 V button battery
  • Unsuitable for spa use
Poolmaster 18305

7. Poolmaster 18305 (Best for Spa & Pool Use)

  • For spa and pool use
  • Large and easy to read display
  • Large profile size polyethylene cord
  • Mercury free pool thermometer

1. Pool Central Pool Thermometer – Top-Rated Pool Thermometer

Pool Central Pool Thermometer
Photo: Pool Central

Here is the top-rated pool thermometer that comes with great value for your investment. The product comes with a great rating because it offers users a combination of great features and value. Moreover, it lasts long and this implies that it saves you money in the long run.

This pool thermometer features a goldfish on its top and this adds a lot of fun in your swimming pool. Moreover, there are various animal themes that you can choose from, giving you options to pick what matches you best.

Additionally, this pool thermometer is easy to read. Therefore, it does not require you to have a set of skills or experience to get the perfect reading. This way, it allows you to keep track of the pool temperature easily.

You will also love that it features a long-lasting nylon cord for anchoring it. The cord is waterproof and so it cannot allow water to penetrate through it and access the internal areas and this implies that it is safe.

The readings of this pool thermometer are given in both Celsius and Fahrenheit and so you get a variety of units to enhance precision. Besides, to ensure that this pool thermometer serves you for a prolonged period of time, it is constructed using heavy-duty plastic material.


  • Remains upright throughout
  • Can easily be spotted around the pool
  • Visually appealing makes it really cute


  • You could deal with connection issues
  • Relatively expensive but worth the cost 

2. Dartphew Swimming Pool Thermometer – Best Budget

Dartphew Swimming Pool Pool Thermometer
Photo: Dartphew Swimming Pool

This is a budget-friendly pool thermometer that you will find on the market, making it highly affordable. The product is competitively priced, which does not mean that quality and longevity are compromised because this pool thermometer works as accurately as of the high-end options.

Do you want to buy a pool thermometer with a quality guarantee to ensure that you get value for your money? Well…. You should consider buying this product because it comes with 12 months warranty and a painless money-back guarantee to ensure satisfaction.

You will also love the fact that this product is easy to use because you need to do is drop it in the pool, pond or spa then read the temperatures. The product is beginner-friendly and this implies that you do not need to have skills or experience to read it accurately.

To ensure that this pool thermometer is environmentally friendly, it is made using high-quality plastic material that is environment protecting.

Another thing that makes this pool thermometer one of the best on the market is the versatility it comes with. You can use it for both indoor and outdoor swimming pools, hot tubs, spas, fish ponds, and aquariums.


  • For indoor and outdoor use
  • Satisfaction guarantee
  • Perfect gift idea
  • Easy to use


  • Requires cleaning every once in a while

3. Milliard Pool Thermometer – Best Versatile Pool Thermometer

Milliard Pool Thermometer
Photo: Milliard

Milliard Pool Thermometer is a versatile product that you can use in different places and it will display accurate temperature readings. You can use it in both indoor and outdoor pools, ponds, fish ponds, aquariums, hot tub, Jacuzzi, and spa.

The pool thermometer comes with an analog scale where it displays the temperature reading. You should consider having the thermometer for 2 hours floating in the pool before reading the temperature. The scale comes with is easy to read and very clear.

Milliard Pool Thermometer has a float made of ABS plastic material that is long-lasting. Therefore, here is a product that will take you through the cold in winter and the heat of summer and still remain in good condition.

You can either choose to tie it at a certain spot around the pool and use the string to access it easily or throw it in the pool and allow it to float freely. With the waterproof design that it features, you do not have to worry about it being damaged by kids as they jump in and out.

This is the best wireless pool thermometer because you will never have to worry about having batteries in the pool. Nonetheless, it features hard to read Fahrenheit temperatures.


  • Cute polar bear at the top
  • Floating design
  • High-quality ABS plastic material
  • Versatile design gives great value for investment


  • Hard to read Fahrenheit temperatures
  • A little expensive but worth the purchase

4. Aquatix Pro Pool Thermometer – Best Durable

Aquatix Pro Pool Thermometer
Photo: Aquatix Pro

Here is a pool thermometer that comes with superior durability facilitated by the premium build that it features. The item has exceptional quality and it is constructed using long-lasting materials. This, as a result, makes it shatter-resistant.

One of the best things about this pool thermometer is that it features a large size and for this reason, you will never have to squint again when reading the pool temperature. On the large display, the temperature is displayed in both Celsius and Fahrenheit.

This is the best floating pool thermometer because it gives precise and accurate temperature readings implying that there is no more guesswork. The maximum temperature reading that you can get when using this thermometer is 50 degrees Celsius and 120 degrees F.

Additionally, this is a gadget that features wide compatibility. Hence, you can use it in different places, including a pool spa thermometer, fishpond thermometer, aquarium thermometer, and hot tub thermometer.

To give you great confidence in the quality and functionality of this thermometer, the manufacturer offers a 1-year warranty and painless money-back guarantee, just in case you sure not satisfied with the item.

The pool thermometer is, however, relatively expensive and so you might spend more on it but it offers you value in return.


  • Durable and shatter-resistant
  • Wide compatibility
  • Large display for easy reading
  • Satisfaction guarantee – 1-year warranty and money-back guarantee


  • Relatively expensive but worth the purchase

5. River Country rc-pt1 – Best Easy to Read

River Country rc-pt1
Photo: River Country

This is an easy-to-read pool thermometer and this is mainly facilitated by the fact that it floats upright while in the pool. For this reason, you do not even need to take it from the pool to get accurate temperature readings.

The item comes with a tie-off tether string which you use to locate the thermometer while in the pool. Hence, you do not waste a lot of time trying to look for the thermometer.

One of the things you will love about this pool thermometer is that it is made using impact-resistant plastic material. As a result, you can be sure that it will not break even when accidentally dropped. The product is built to last and so it saves you money in the long run.

River Country rc-pt1 is a versatile product that you can use in different places due to its wide compatibility. Therefore, you can use this item for hot tubs, ponds as well as pools.

The thermometer gives temperature readings in both degrees Celsius and degrees Fahrenheit. Nonetheless, this product only gives temperature readings of water surface temperature.


  • Easy to read as it floats upright
  • Built to last and serves for ages
  • Wide compatibility
  • Relatively cheap


  • Gives readings of surface temperature only

6. Milliard Pool Thermometer – Best For Indoor and Outdoor Pools

Milliard Pool Thermometer 6
Photo: Milliard

Milliard Pool Thermometer is a product designed for both indoor and outdoor use and so you will love its wide compatibility to suit different places. As a result, you can use this pool thermometer in spa hot tubs, aquariums, ornamental ponds, fish ponds, and Jacuzzis.

You will love its easy-to-read design that is mainly facilitated by the large digital display it features. To enhance its user-friendliness, you can use this display to reset it, turn it on or off or even switch between degrees F and Degrees C.

The product comes with a nylon rope which you can use to attach it to the pool walls. This way, the thermometer can always float on water and you can easily locate it while in the pool.

This pool thermometer uses a 1.5V button battery which features a 3-minute auto-off function that comes in handy when you need to preserve the battery life.

Nonetheless, it is unsuitable for spa use because it appears to steam up inside, making it unreadable while in the spa.


  • Simple but functional design
  • Large and clear display
  • Preserves battery life
  • Readings in both degrees C and degrees F


  • Unsuitable for spa use
  • Unreadable in hot water

7. Poolmaster 18305 – Best Spa and Pool Thermometer

Poolmaster 18305
Photo: Poolmasterv

Poolmaster 18305 is designed for spa or pool use and this implies that it can withstand high temperatures without steaming inside.

You will consider this item the best digital pool thermometer on the market because of the large and easy-to-read display that gives results in both Celsius and Fahrenheit. The display is shatter resistant and comes with an alcohol-based indicator.

Additionally, it features a large profile size with an integrated pocket reservoir that plays a great role in capturing water when you want to read the water temperature out of the pool. This further boosts precision and also flexibility.

To ensure that you can easily spot this thermometer while in the pool, it comes with a polyethylene cord to fasten it on the walls of the pool. This saves you a considerable amount of time when looking for it in the pool.

Poolmaster 18305 uses a mercury-free pool thermometer that uses an alcohol-based indicator that is non-toxic. This product comes with great accuracy and precision, and so you should make your order today as stocks last.

You can easily access this pool thermometer at a pocket-friendly deal because it is fairly priced. However, the string could deteriorate with regular use but it works pretty well even without the string.


  • Accurate temperature readings
  • Large numbers make it easy to read
  • Shatter-resistant material makes it long-lasting
  • Fairly priced to enhance affordability and provide value


  • The string might need to be replaced with regular use
  • The calibrations have a similar color to that of the casing, making it hard to read


Here are pool thermometer reviews that will help you spot the best for your pool and budget. Your pool should always have an optimum temperature of 28 degrees Celsius. To make sure it is friendly enough for kids to use comfortably, make sure the temperature a degree or 2 cooler.

From the list of pool thermometers above, pick the best that will give you the best service at a budget you can afford. Make your order today as stocks last.