Measuring and maintaining water temperature is complicated.
Water temperature is variable and easily influenced by changing weather, temperature, and movement conditions.
Having a suitable water temperature measurement device can make things considerably more accessible—but with hundreds of options to choose from, you may not know where to start.
This guide includes everything you need to know about the best water temperature measurement devices to save time and money in finding the suitable device for your needs.
What is a Water Temperature Measurement Device?
Water temperature measurement devices are an incredibly useful asset that cold plungers use to ensure their pools are the right temperature for the desired health and wellness-related benefits.
Practitioners of the Wim Hof method want to maintain water at a cold temperature so they can track their cold training intensity and measure how their body reacted to it..
A medical thermometer is not adaptive for such purposes since it is unlikely to be waterproof and only measures a narrow range of temperatures.
The suitable water temperature measurement device is:
- Affordable
- Functional
- Waterproof
- Multi-functional
- Easy to use
- Durable
Using the above list of criteria, we’ve assembled the best water temperature measurement devices for your needs.
The Best Water Temperature Measurement Devices
There are thousands of devices available for sale online—but few offer the value of those listed below.
Consider choosing from the following list to find the water temperature measurement device for your needs.
1. Yacunama Digital Water Thermometer – Best Overall
This digital thermometer is perfect for most uses.
It is a cordless, wireless, battery-powered thermometer that can measure temperatures down to -57 degrees Fahrenheit (-50 Celsius).
It is entirely waterproof and shatter-resistant, so you can trust this device’s durability.
Best of all, it is affordable and accessible across multiple platforms, so you can easily find it online or in stores.
Key Features
This thermometer can also be used for other areas – from the kitchen to the bathroom.
Consider the following features:
- Wide range of temperature measurement
- Battery-powered & batteries are included
- Waterproof and shatter-resistant
- 100% money-back guarantee
- Lifetime warranty
- Durable and resistant to damage
- Long probe
- Robust, sleek design
Pros & Cons
Consider the pros and cons below before investing in this product.
| Pros | Cons |
| Affordable and easy to use Measures a wide range of temperaturesWaterproof Lifetime Warranty with 100% money-back guarantee | Reading window fogs up at times Occasionally turns off on its own |
2. BlueFree Pool Floating Thermometer – Runner-Up
This adorable thermometer is blue and yellow—with a plastic whale on top!
Although it is a pool thermometer, it is small enough to use in a bath, aquarium, or basin. It includes a high-precision temperature sensor and floats seamlessly on the water’s surface.
It is waterproof, shatter-resistant, and easy to use and read!
Key Features
The BlueFree Pool Floating Thermometer offers the following features:
- Adorable design
- Comes with a string attachment
- Wide temperature range
- Adaptive to most uses
- High accuracy
- Shatter-resistant and water-proof
- Measurements in Celsius and Fahrenheit
Pros & Cons
This product offers several benefits and drawbacks. Consider the chart below.
| Pros | Cons |
| Affordable and easy to use 12-month warranty & money-back guaranteeQuick readings Displays in both Fahrenheit and Celsius | Not as durable as other options Limited temperature range String is fragile |
3. ThermaWorksThermapen One – Most Accurate
This small thermometer packs a punch.
Although it is more expensive than most, it offers unparalleled accuracy and precision, measuring water temperatures to .3 degrees Celsius.
The Thermapen comes in several colors, including red, blue, and white—and it folds, so you can fit it neatly in your pocket and bring it on the go.
This thermometer has an attractive, waterproof case, so you can keep it safe from the elements when traveling.
Key Features
Key features of the ThermaWorks Thermapen One include:
- Unparalleled accuracy
- Broad temperature range (-58 to 572 degrees Fahrenheit or -49.9 to 299.9 degrees Celsius)
- Full reading in one second
- Sleep mode after 10-180 seconds
- Sleep mode is configurable
- Water-resistant and shatter-resistant
- Battery-powered
- Weighs only 115 grams
- Rotating LCD
- Backlight option
Pros & Cons
The Thermapen offers several unique benefits—and some drawbacks.
| Pros | Cons |
| More accuracy than most Wider range than most Extremely light, foldable, and easy to carry Extended warranty | More expensive than other options.Backlight is relatively weak |
4. Cooper Atkins DFP450W Digital Pocket Test Waterproof Part – Most Safety Features
This light, portable thermometer features an attractive, bright-yellow design and super-long probe. It boasts impressive specs, including an alarm setting that notifies you if the water has reached a given temperature.
This thermometer is accurate and fast. It’s a safe option for students using them for projects and won’t contaminate an aquarium if you use it to keep your fish comfortable.
Cooper Atkins is a leading brand in temperature and humidity measurement devices, so you can trust this item’s durability and quality.
Key Features
Consider the key features of the Cooper Atkins DFP450W Digital Pocket Test before investing in this product.
- Battery-powered
- Five inches (12.7 cm) long
- 1.92 ounces (54.4 grams)
- 500-millisecond response time
- Measures up to 450 degrees Fahrenheit (232 degrees Celsius)
- Waterproof, shatter-resistant
- Backed by a quality brand
- Built-in alarm that notifies you when the temperature reaches a certain point
- Turns off automatically after a given number of seconds
Pros & Cons
This product offers several unique benefits and drawbacks. Consider the list below.
| Pros | Cons |
| High-speedLight, easy to carry, and highly portableReliable and durableBuilt-in safety features | Not as accurate as othersTurns off too quicklyMore expensive than othersNo money-back guarantee |
5. JW Aquarium SmartTemp Thermometer – Most Affordable
The JW Aquarium SmartTemp Thermometer is an excellent choice for those seeking a quick and easy solution.
This thermometer is light, affordable, and portable, making it an excellent option for beginners. It has comprehensive instructions and there is no exposed metal, so you don’t have to worry about rusting.
Consider this product if you are just starting or do not wish to make a more substantive investment.
Key Features
The JW Aquarium SmartTemp Thermometer offers several distinct and essential features.
- Magnet to keep it in place
- Goes up to 104 degrees Fahrenheit (40 degrees Celsius)
- Four inches (10.16 cm) long
- Works inside and outside of water
- Battery-powered
- Easy to use and calibrate
- Plastic coating to prevent corroding metal