Do you want to make sure that the temperature of the pool’s water is perfect before you get in it? Of course, you do! But for this, you need to use a pool thermometer, just like the ones shown in the comparison table below. These thermometers are able to accurately display what the temperature of the water is, ensuring that you and your loved ones won’t enter the water when it is too cold. Best of all, these items come with features and accessories that make them highly convenient to use, like display consoles that even allow you to monitor the temperature without leaving the comfort of your own home. But let’s not waste time and get to finding out what the best thermometers on the market are.

Top 7 Digital Pool Thermometers Comparison

Photo Product Name Price
Ambient Weather WS-20 Image

1. Ambient Weather WS-20

  • Line of sight: 300 feet
  • Frequency: 433 MHz
  • Locations monitored: 8+
  • Power: Solar powered with battery backup
  • Included content: Transmitter and receiver
  • Warranty: 1 year
Ambient Weather WS-14 Image

2. Ambient Weather WS-14

  • Line of sight: 300 feet
  • Frequency: 433 MHz
  • Locations monitored: 8
  • Power: Solar powered with battery backup
  • Included content: Receiver and transmitter
  • Warranty: 1 year
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Walfront Digital Floating Pool Thermometer Image

3. Walfront Digital Floating Pool Thermometer

  • Line of sight: 100 meters
  • Frequency: 433 MHz
  • Locations monitored: 3
  • Power: Alkaline batteries
  • Included content: Transmitter and receiver
  • Warranty: 1 year
Pellor BO-SPWT12 Image

4. Pellor BO-SPWT12

  • Line of sight: N/A
  • Frequency: 433 MHz
  • Locations monitored: 3
  • Power: Battery powered
  • Included content: Receiver and transmitter
  • Warranty: 6 months
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Swimline First-Class 9250 Image

5. Swimline First-Class 9250

  • Line of sight: N/A
  • Frequency: 433 MHz
  • Locations monitored: 1
  • Power: Solar powered with battery backup
  • Included content: Thermometer
  • Warranty: 30-day money back guarantee
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Joystar PoolT-433Mhz Image

6. Joystar PoolT-433Mhz

  • Line of sight: 100 meters
  • Frequency: 433 MHz
  • Locations monitored: 3
  • Power: Battery powered
  • Included content: Transmitter and receiver
  • Warranty: 30-day money back guarantee
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CyberDyer Digital Wireless Floating Hydrotherapy Spa Thermometer Image

7. CyberDyer Digital Wireless Floating Hydrotherapy Spa Thermometer

  • Line of sight: 100 meters
  • Frequency: 433 MHz
  • Locations monitored: 3
  • Power: Battery powered
  • Included content: Receiver and floating transmitter
  • Warranty: 30-day money back guarantee
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Pool Thermometers Evaluation

Ambient Weather WS-20

Highly convenient to use as it lets you find out the pool water’s temperature regardless of your location, whether you are indoors or outdoors, the WS-20 is a must-have for any pool owner who dreads venturing in water that is too cold. It comes at a reasonable price and what it is highly regarded for is its accuracy in the readings it provides. The comprehensiveness of its operation is hard to top, any issue that you might have with using it being covered in the accompanying user manual. With an update rate of 60 seconds, you are ensured of the fact that the provided readings are of actuality. It comes with a console and the thermometer itself, a wireless transmission existing between the two. Furthermore, if anything interrupts the transmission, the re-sync mode reestablishes the connection so that no operational issues exist.


There are two thermometers included in the package, more precisely a wireless model and the floating thermometer. The floating thermometer measures 8.5 inches in length, 4.2 inches in width, and 3.7 inches in height, and you simply have to dip it in the water for it to start reading the temperature. In open air, under ideal conditions, it provides a 300-foot line of sight wireless transmission, and it features an 8-channel selectable switch. The LCD display makes it easy to read temperatures off of it when you are outside, while the 60-second update rate ensures the provided temperatures are of actuality. The wireless thermometer included works outdoors when the temperature ranges from -40 to 140 degrees Fahrenheit, and updates the readings it provides once every 60 seconds. Furthermore, it provides dip switch selectable remote channels, and its maximum line of sight is 300 feet.


In addition to displaying the readings that the other thermometers pick up so that you may learn what the pool water temperature is without getting out of the house, the console also reads indoor temperature. It can be used to monitor up to 8 different locations at a time, and it requires 4 AAA batteries to run. Its re-sync mode really comes in handy as it ensures reception between it and the thermometer will be automatically reestablished in case an interruption occurs. It features a clear LCD screen that measures 3.75 inches in length and 3.5 inches in width. Furthermore, the console itself measures a mere 4.5 inches in length, 5 inches in height, and 1 inch in width.

Mention Worthy Details
  • Provides convenient dip switch selectable remote channels.
  • Its outdoor operational temperature ranges from -40 to 140 degrees Fahrenheit.
  • Sends off audible and visual alarms when the temperature passes the minimum and maximum settings you have set.
  • Perfect for all fluid based operations, not limited to use in the pool.
Line of Sight

The product’s line of sight is one of the main interest points as it shows what is the distance that can be kept between the transmitter and the receiver. With the WS-20, you enjoy a great line of sight ranging up to 300 feet in ideal conditions where there are no serious obstructions along the way. However, in most conditions, where thick walls and other impediments exist on the path between the two, the line of transmission provided is of approximately 100 feet.

Impressive update rate once every 60 seconds ensures correct temperature readings
Selectable switch lets you choose any of the 8 different channels
LCD display offers a convenient, easy manner to keep track of the pool water
Battery backup ensures it will never cease to operate, regardless of the conditions

Ambient Weather WS-14

If you are looking to purchase an efficient swimming pool thermometer that is able to read your water temperature from both indoors and outdoors, then the WS-14 is the best choice you can make. This device is waterproof and floats on the surface of the water. It has a sensor display and will wirelessly transmit the water temperature to the display console. Additionally, it has an 8-channel selectable switch that will allow you to monitor the temperature from up to eight different locations. It also has a sensor search mode that can be used to re-sync sensors without re-inserting or removing batteries. The WS-14 features a screw-lid design with an internal gasket that will provide a leak free. In addition, it comes with one remote and 7 sensors that can be added for comprehensive monitoring. It is important to know that each sensor has dip switches for units of measure and channel selection.

Water resistant design The wireless signal will not penetrate solid metal or earth.
It includes one remote
Easy to use
Affordable and Reliable

Walfront Digital Floating Pool Thermometer

A water temperature device for the pool that you can rely on, the Walfront is one of the more accessible options price-wise, and one of the most accurate as well. The floating transmitter it comes with is waterproof, and it is perfect to use in indoor as well as outdoor swimming pools. It can withstand providing readings in water that has a -58 to 140 degrees Fahrenheit temperature, while the indoor temperature it can read ranges from -40 to 140 degrees Fahrenheit. Its 100-meter wireless transmission line is pretty standard when compared to what other pool temperature measuring devices provide. It boasts a 90-second update rate which ensures live, accurate readings. The power display console is powered by two AAA alkaline batteries, while the remote sensors are backed by two AA alkaline batteries. Furthermore, it is backed with a 1-year warranty by the manufacturing company.

90-second update rate
Easy to use – simply follow the instructions provided in the manual
Accessible price makes it perfect for those who are on a budget

Pellor BO-SPWT12

The BO-SPWT12 is another great choice for all those who want to find out what the temperature of their swimming pool is. This is a multi-functional model that receives 3 channels water temperature. It monitors both maximum and minimum record of indoor and water temperature, helping you discover the increases and decreases in water temp over time. Moreover, it is important to know that the device measures the indoor temperature from 0C to +50 C, while the outdoor temperature range is -40C to +60C. The receiver needs 2 AAA 1.5 V alkaline batteries, while the transmitter uses 2 AA 1.5 alkaline batteries. The batteries are not included, but it won’t be hard to find batteries when they run out. Plus, you can use rechargeable batteries if you want to be more eco-friendly. This waterproof and floating outdoor transmitter also comes with other features, including a calendar from 2000 to 2099 and a time alarm function with snooze.

It is digital Few features
It floats
Affordable and easy to use
User manual included

Swimline First-Class 9250

This swimming pool solar model is definitely worth to consider in case you are planning to monitor the temperature of your pool water. It has a large, and easy to read LCD display, which provides information about the water temperature. Additionally, it includes a solar powered battery. This means that it is powered by the sun and you do not have to change or recharge the batteries. The device measures from 0°C to +50°C and 32°F to 122°F. It also comes with a nylon tether that will help you secure it to your pool ladder or deck. However, if this seems too complicated, you can simply place it in your skimmer basket. Nowadays, most people are using it, because it is affordable, it has a compact design and it is easy to read. In short words, it provides a lot of benefits. Therefore, if you tired of using your old mercury style thermometers, you need to consider this high quality and first-class digital device.

Easy-to-read display
Water resistant
High quality
Great value for money

Joystar PoolT-433Mhz

The PoolT-433Mhz is definitely one of the most efficient pool thermometers available in the current market, being a great solution for swimming pool owners. It measures both indoor and outdoor temperatures in the swimming pool, spa and pond. It is waterproof and has the ability to float on the surface of the water. It comes with a sensor that transmits the water temperature to the display console that also includes an indoor thermometer for monitoring air temperature. Moreover, it can receive 3 channels with 433MHz/100m distance. Plus, it receives water temperature from up to 3 locations. It can record both maximum and minimum value of indoor and water temperature. It measures water temperature from -40℃ to +60℃(32°F to +122°F), while indoor temperature is measured from -10℃ to +50℃(-40°F to +140°F).

User manual included No batteries included
It has a waterproof function
Easy to use and maintain

CyberDyer Digital Wireless Floating Hydrotherapy Spa Thermometer

By using this product, you can monitor your swimming pool water temperature 24/7. Most people are using this model because it is easy to operate and install. It features a remote floating sensor which can switch the channel between 1,2 and 3, in order to optimize the transmission. Furthermore, it is important to know that it measures water temperature from -40℃ to 60℃ and indoor air temperature from -10℃ to 50℃. The pool sensor can float up to 30 m depth and 433MHz wireless up to 100m in open field. Additionally, it comes with a time alarm that alerts you if the temperature is not within your defined range. Plus, this function can be set for when the pool reaches a certain temperature. This way, you will know when it is the perfect time in the day to swim at the temperature you like. Therefore, if you are looking to purchase a very handy device that can provide you with a lot of benefits, this is the best device you can find.

Remote sensor
Easy to operate and install
Instruction manual included

What You Should Know About the Thermometers

As a swimming pool owner, there are a lot of aspects that you need to take into consideration when ensuring that the water is safe to swim in. One of the main elements is the temperature of the pool water, as you have to make sure that it is not too high, moment when you will sweat and feel uncomfortable when swimming in it, but that it is not too low either as you might catch a cold due to the low temperature of the water.

This is where the digital pool thermometer comes in handy as it allows you to keep a constant eye on the temperature of the water, thus getting the chance to be aware of when it is truly safe to enter the pool. Generally, these specialty pool devices do not come at unreasonable prices, so there is no need to worry that your budget might be thrown back too much due to making the purchase. Additionally, they are incredibly easy to use, and most of them come with a receiver that allows you to monitor the pool’s temperature without going out of the house.

While it is true that this device is a must-have for all pool owners due to the safety element that it adds to the swimming experience, it is especially great to have for those who have small children. The small ones are a lot more sensitive than adults, and the last thing you want is for your child to catch a cold in the middle of summer due to swimming in cold water. Thus, make a small effort and invest in the thermometer to ensure everyone’s well-being.

Why You Need a Thermometer for the Pool

Although pool thermometers usually are not big investments, some people are still not receptive to the idea of investing in them, which is a shame considering how much you could benefit from owning one. If you are one of the pool owners who still does not have a thermometer, read the following lines to find out what are the advantages of owning it, and you will surely understand why it is a necessity.

  • Digital thermometers are extremely easy to use, this being a major advantage especially for those who are not tech savvy and who tend to be overwhelmed by intricate devices. The display of these thermometers is easy to read, meaning that you won’t have a hard time figuring out what the temperature is. Also, as you have already noticed, most of the models in our top come with receptors that allow you to check the temperature of the pool’s water without leaving the house.
  • Another aspect that makes owning it necessary is the fact that it delivers fast and accurate results. By using it, you will be constantly aware of the precise temperature of the water, so you won’t get in it until it is perfect and safe to swim in. This comes in handy especially for those who have small children, the kids not being safe if they swim in cold water, being in danger of catching colds.
  • Another advantage of using these products is the fact that they are compact in size, so it is easy to find a storage space for them when winter comes and you won’t use the pool anymore. Also, they do not occupy much space in the water and they won’t present an inconvenience for those who are swimming in the pool either, thus being the ideal temperature measuring tools.

What to Look for When You Go Shopping

Although swimming pool thermometers are small and easy to use, this does not mean that finding a great performing model is an easy task. On the contrary, with so many digital thermometers on the market, sticking to a certain model becomes hard as you get overwhelmed by the variety of products. To make your search easier, we will show you in the following lines what you must look for when you go shopping in order to make a smart investment.

  • Line of Sight

  • The line of sight indicates how far the device can wirelessly transmit the data that is gathering regarding the pool’s temperature. When you buy a digital thermometer that works with a transmitter, it is crucial to pay attention to this spec as it shows how far away from the thermometer you can keep the transmitter. The top tier pool thermometers on the market offer a generous line of sight of at least 300 feet, thus allowing you to place the transmitter in the house and check the pool’s temperature without stepping outside.

  • How It Is Powered

  • As you have already noticed if you paid attention to the comparison table above, these devices are either exclusively battery powered or they are solar powered and they have a battery backup. Undoubtedly, the solar-powered models are a more Eco-friendly choice to go with, and we recommend that you invest in them.

  • What Is Included in the Package

  • Some thermometers come on their own, while others come with a transmitter onto which the data gathered by the digital thermometer is transmitted to offer you a more convenient manner of finding out how cold or warm the pool water is. Obviously, it is a better deal to invest in a model that comes with both a receiver and a transmitter because the price difference is not that big and you will have a more easy-to-use device as well.

  • Warranty

  • The warranty that backs up a pool thermometer not only shows for how long the manufacturer is willing to repair or replace the product free of charge, but it shows how much the manufacturer trusts the device as well. Thus, a 1-year warranty like the one offered for the Ambient Weather WS-14 shows that this is a high-end thermometer that was made with durable materials and attention was paid to every detail when manufacturing it. We recommend that you not neglect this aspect if you want to make sure that the digital thermometer you invest in is actually of a superior quality.

Useful Troubleshooting Guide

Pool thermometers, just like all other digital products, can be faced with functionality issues. A troubleshooting guide comes in handy as there are common malfunctions that usually occur, and the fixes to these issues are generally easy. To put it in better words, you will likely be able to resolve certain problems without having to call the customer support department and ask for guidance or call in a professional to repair the product.

Problem How to Fix It
Wireless remote does not communicate with the station
You have passed the line of sight communication range. You must move closer to the remote sensor.
Remove and reinsert the batteries. The station might have exited the search mode.
Move the station away from other wireless transmitters or receivers, TVs, laptops, and all electrical noise emitting devices.
Make sure that there is not an earth barrier or solid metal wall in the path of the remote sensors.
Install new batteries – go with lithium-ion.
Weak display station contrast Batteries are running out of power – replace them.
Different temperature displayed on the station and the remote sensor When the transmission is intermittently lost, the station and the sensor disagreeing on results, you must take the thermometer to a professional service.

There is a real need for a thermometer in the swimming pool, as you most likely have already understood after reading this article. Otherwise, how can you tell when the temperature is right for you to jump in? If you have paid attention to what you read, you are already aware why the Ambient Weather WS-14 is our number 1 pick. Not only is it intuitive to use, an advantage not to be taken lightly, but it provides a wireless transmission line of sight of up to 300 feet, more than what most similar products offer. However, this is not to say that our other entries are less qualitative as the Pellor BO-SPWT12 can monitor the water temperature in three different locations, while the Swimline First-Class 9250 is a desirable option as it is solar powered.

Frequently Asked Questions

?Is there anything that can affect the wireless signal transmission between the receiver and transmitter?
Woefully, solid metal and thick structures do present issues when it comes to the quality of the wireless transmission. Thus, in case any of these obstacles are in the way of the transmitter and receiver’s positions, you are automatically obliged to change the location of the receiver. Otherwise, the two devices will not be able to communicate the data gathered and you won’t be able to remotely check the temperature of the pool water.

?What is the ideal transmitter line of sight?
There is no actual ideal line of sight length as it depends on your specific needs. If your house, more precisely the room closest to the pool or the one you intend to place the receiver in, is very far from the pool, say 250 feet, you should automatically purchase a digital thermometer that offers a 300-foot wireless transmission line of sight range like the Ambient Weather WS-14. Check what the distance between the pool and your home is, and buy an appropriate thermometer according to that measurement.

?Can the thermometers be tethered to the ladder?
Yes, you need not worry the thermometer might end up in the skimmer or anywhere else as you can safely tether the small device to the ladder or deck of the pool. Some models, like the Swimline First-Class 9250 for instance, even come with nylon tether for this specific purpose. Obviously, in case the product does not come with a tether itself, you can improvise and use a rope or buy a nylon tether from any store as it is a cheap purchase.


  1. Laura says:

    I own the Ambient Weather WS-14 model, and I’m impressed by its performance. Not only does it have an amazing line of sight, but I tested its accuracy, and it’s truly great.

  2. Keira says:

    I recently purchased the Joystar PoolT-433Mhz after reading more about it here. It really does make a big difference to use such a product, I recommend that other pool owners invest their money in one as well.

    • Jane Warner says:

      We’re glad that the products we reviewed helped you increase the quality of your experience using the pool. We recommend that you look at our other products, such as robotic pool cleaners, to make it even more enjoyable to use the pool.

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