Hygrometers measure the level of moisture in the air. They help you keep track of the humidity level in your home, which is useful if you are trying to reduce or prevent mould and damp.
They’re very useful gadgets to have whether you live in a damp home yourself or want to check that a property you are letting will be comfortable and healthy for your tenants.
Too much humidity can cause damage to furniture, encourage mould to grow and lead to health problems. Too little humidity can be a problem too, as dry air can lead to dry skin and chapped lips.
With a good indoor hygrometer you can check the relative humidity level to make sure it’s at a safe level, or check that your dehumidifier or humidifier is working properly. If you’re a cigar aficionado, you can place a small hygrometer inside your humidor to make sure that it has the correct humidity.
A healthy humidity level in the UK is about 50-55% relative humidity (RH). Several of the hygrometers reviewed here show a smiley face when the humidity is at this level.
The inexpensive home hygrometers reviewed below are rarely 100% accurate, but they should be accurate enough to make sure your home is neither too humid nor too dry.
Best Hygrometers in the UK
1. ThermoPro TP55 Digital Thermo-hygrometer
The ThermoPro TP55 is one of the most popular home hygrometers in the UK. It has a large LCD screen that displays a lot of information about both the humidity and temperature in your home. The screen also has an icon that shows if the humidity is too low, too high or ideal.
- 4-inch backlit LCD display (backlight stays on for a few seconds after the button is pressed)
- Measures temperatures from -50 to 70 °C and humidity from 10 to 99% RH
- Celsius and Fahrenheit modes
- Stores maximum and minimum humidity and temperature readings from the past 24 hours or all time (you can switch between 24 hrs and All Time modes)
- Refreshes reading every 10 seconds
- Takes 2 AAA batteries (included)
Dimensions: 11 x 8.5 x 2.4 cm
Weight: 145 g
- Good value for money
- Batteries last a long time
- Large, easy to read screen showing lots of information
- Temperature reading is very accurate
- Easy to use
- Humidity readings aren’t always 100% accurate
This hygrometer is affordable, easy to use and very smartly designed. It has a big screen that shows all the humidity and temperature information you’re likely to need, making it our number 1 pick right now.
2. Inkbird Dc 3V Input Digital Hygrometer
This hygrometer from Inkbird is designed to be used in cigar humidor boxes. It’s very small and thin so it will easily fit inside a humidor, and displays both the temperature and relative humidity. As well as humidors, you can also use it in other small spaces such as guitar cases.
- Choice of showing temperature in Celsius or Fahrenheit
- Measures humidity from 30-90% RH
- Uses a 3V CR2032 button battery
Dimensions: 10.4 x 3.6 x 1.6 cm
- Good value for money
- Very small and compact
- Isn’t always accurate
The Inkbird Dc 3V Input Digital Hygrometer offers great value for money and is a good choice for a humidor or a guitar case. The accuracy can vary, so you might want to test it with a calibration kit or compare it to another hygrometer.
3. ETI Healthy Living Thermometer & Hygrometer
This hygrometer has a colour-coded display showing whether your home is too dry, too wet or at an ideal ‘comfort’ level. It measures the temperature in both Fahrenheit and Celsius and displays the relative humidity as a percentage.
- Switch for changing between Celsius and Fahrenheit
- Digital display showing temperature and humidity levels
- Dial that clearly shows when the humidity is too high
- Foldaway stand
- Slot for attaching the hygrometer to a wall
Dimensions: 13.4 x 10.6 x 2.6 cm
Weight: 159 g
- Clear display with both an exact humidity reading and a dial to show when it’s at the right level
- Straightforward and easy to use
- Generally accurate
- It would be good if the hygrometer had a clock so you could see the time while checking the humidity
- Doesn’t automatically reset the minimum and maximum readings
The ETI Healthy Living Thermometer & Hygrometer is a useful product that will give you a clear indication of whether or not your property is too damp. It lacks some useful features such as a clock, but the display is useful with its combination of a digital display and a dial.
4. Criacr Digital Hygrometer
- Display in Fahrenheit or Celsius
- Strong wireless signal penetration (433MHz frequency)
- Data refreshes every 60 seconds
Dimensions: 7.5 x 5.8 x 1.9 cm
Weight: 130 g
- Monitor temperatures from large distances
- Extremely easy to setup
- Crystal clear LCD makes it easy to read
- Batteries are not included (2 x AA)
Not only is this product extremely accurate, but it also provides excellent value for money for those who have more dynamic usage requirements, such as in camper vans or garages.
5. TFA 30.5026.01 Moxx Digital Thermo-Hygrometer
- Temperature range of 0 to 50°C (choice of Celsius or Fahrenheit mode)
- Humidity range of 20-99%
- CR2032 battery included
- Smiley face icon appears when the humidity is at a healthy level
Dimensions: 5.7 x 1.3 x 6.9 cm
Weight: 70 g
- Good battery life (6 months+)
- Small and fits in the palm of your hand
- Clear LCD screen that you can read even when standing metres away
- Quickly adjusts the temperature and humidity readings
- Stand provided is sturdy
- Looks nice
- Not always completely accurate
The TFA 30.5026.01 is one of the best value hygrometers you can get for using in the home. It’s affordable and generally delivers great results, even if it’s not always 100% accurate.
How to Choose a Hygrometer
The best hygrometer for you depends on your particular needs. If you are after a hygrometer for a specific task, like putting in a musical instrument case, for example, you will need one that is small enough to fit inside without damaging the instrument.
If, though, you are looking for a hygrometer for a room, if it is too small it will be difficult to read correctly from a distance.
So, here are some considerations to make when looking for hygrometers.
Some analogue hygrometers are pretty difficult to read. If you need reading glasses, you’ll need to find them each time you want to monitor the humidity in your home. This can get a bit frustrating.
Digital hygrometers, on the other hand, are really easy to read for the most part. There are many that have simple displays that allow you to read them at a glance.
If you intend to use your hygrometer to monitor the humidity in an entire room, one of these simple-to-read digital ones may be the way to go. That way, you can see the readout clearly from anywhere in the room. Plus, the numbers displayed are highly accurate on most digital hygrometers too.
We mentioned the size of hygrometers above, but this is really important. You can find incredibly small hygrometers designed to go in cigar boxes, for example.
You can also find ones for musical instrument cases that can be tucked away inside without the fear of damaging the instrument or the case.
If you’re buying a hygrometer for a specific task like the ones above, size really does matter. If you are buying one to monitor the humidity of your home, then the larger the screen or the display is, the better you’ll be able to read it from a distance.
Some hygrometers available in the UK measure the temperature in Fahrenheit, some measure in Celsius, and most digital ones can be programmed to measure in both. Choose the hygrometer that suits the temperature readings that you are most comfortable with.
All of the hygrometers we mentioned above are really accurate, but some that are available are not accurate at all.
If you don’t choose one of the hygrometers from our list, try and find out about the accuracy of the one you intend to buy. Customer reviews are a great source of accuracy information.
Are digital or analogue hygrometers more accurate?
Digital hygrometers are more accurate than analogue ones and can often track more information too.
There are some models that can even track temperature and humidity changes over very long periods of time. So, if accuracy is a massive concern, a good-quality digital hygrometer is the best way to go.
How do you know if a hygrometer is accurate?
To fine-tune a hygrometer to be as accurate as possible, you can dampen a towel, wrap the hygrometer in the towel, wait for 30 minutes and quickly read the meter. If it says 100% humidity, it is as accurate as possible. If it doesn’t, you’ll need to calibrate the meter.
Most analogue hygrometers can be adjusted with a knob. Most digital hygrometers can also be adjusted and should come with instructions on how to calibrate them. If you can’t calibrate your hygrometer, you can take note of the difference and remember it for future reference.
Where is the best place to put a hygrometer?
The best place to put a hygrometer in your home is in a common living area. It shouldn’t be near any windows or rooms that create excess humidity (like the bathroom or kitchen, for example). So, a living room or hallway are good places.
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