When it comes to finding the best hygrometer, whether that is for your cigars, musical instruments, you suffer from allergies, or simply because you want to avoid mold growth indoors there are a few things to consider, which we talk about in our handy buying guide.
All of the models we have listed here are digital hygrometers because they tend to be the most inexpensive and just as importantly the most accurate.
We made sure to include models suitable for all price ranges, those that can function wirelessly, those that are accompanied with a handy app for ease of use, and more, to ensure that all bases are covered.
- 1 Hygrometer Comparison Table
- 2 Hygrometer Reviews
- 3 Hygrometer Buying Guide
Hygrometer Comparison Table
The AcuRite 00613 Indoor Humidity Monitor has been one of the most popular and bestselling hygrometers for some time now, largely thanks to its accuracy, inexpensiveness, and ease of use.
AcuRite state that the humidity accuracy is within +/- 3% and the temperature accuracy within +/- 2%. In general, users seem to agree with these numbers, making it one of the very best choices on the market, if not the best, in its price range.
The monitor is very easy to use, requiring just a single AA battery and displays everything you need to know in a nice and easy to read format. For example, there is a home comfort icon on the monitor that informs you of whether the humidity in the room is at an ideal level, too high, or too low. This is based on the Relative Humidity readings.
The frequency of readings occurs every 15 seconds, which should be sufficient for everyone looking to purchase a hygrometer. High and low records for both the temperature and humidity are measured over the past 24-36 hours.
A couple of other things worth knowing include how the temperature can also be toggled between Fahrenheit or Celsius, and the fact that there are several mounting options available, which is always a plus. These include magnetic backing, a clip, and a fold-out stand, so you can easily find a placement that works best for your room.
Caliber IV Digital Hygrometer
The Caliber IV Digital Hygrometer is mainly used to ensure that your cigars are stored in ideal conditions, but is also used with a high degree of satisfaction by many for both musical instruments (particularly due to its small size) and to measure room humidity.
It is one of the most accurate models on the market in its class, with a margin of error of just +/- 1% between 40-80 %. Below 40% and over 80% the accuracy stands at +/- 3%. Many more or less agree with these numbers.
It’s nice to see that the device comes pre-calibrated right out of the box, which isn’t always the case with hygrometers. The same applies to the inclusion of a battery so you don’t have to buy one yourself.
The device really is quite small, but this doesn’t mean that the numbers are hard to read. A quick glance at the display tells you both the temperature and humidity, with the frequency of updates standing at a very efficient 10 seconds.
A couple of other features include the ability to switch between Fahrenheit and Celsius, and installation via a magnetic mount or stick on metal plate.
All in all, if you are concerned with looking after your cigars there is no better device on the market. It also does an impressive job for musical instruments and indoor room humidity too.
Ambient Weather WS-07
If you’re looking for a wireless model then you’ve found it with this monitor from Ambient Weather.
The WS-07s has a terrific transmission range – up to 300 feet in fact – and has no problem functioning through several walls in your home. It comes with one remote thermo-hygrometer as standard, although seven further sensors can be added if you desire.
It’s nice to see just how large the numbers on the display are (1.25”), so you can easily get a reading from across the room and is also something that elderly people who can’t see as well as they once could will appreciate.
The update rate is a little slower than others, standing at 60 seconds, but the frequency of updates should suffice for most. There is also a scroll mode that gives you the option of being able to view the remote channels and hygrometer without having to press any buttons, displayed in 5 second intervals.
One often overlooked aspect but is certainly worth mentioning is its user manual. The user manual tells you everything you need to know and goes quite in-depth to get the most out of the monitor to ensure you don’t frustratingly have to spend time Googling the answers you’re looking for.
The WS-07 requires 4x AAA batteries for the main unit and 2x AAA batteries for the remote sensor. Calibration is not required either.
SensorPush Wireless Thermometer / Hygrometer
If you’re looking for a wireless hygrometer AND want to view readings on your phone and be alerted whenever there is an issue, then is no better choice than the SensorPush.
We absolutely love this top rated hygrometer for its ease of use and so do many others. It has a longer transmission range than the Ambient Weather WS-07, standing at 325 feet rather than 300 feet and has no problem traveling through very thick walls throughout your home.
Every minute data is collected and is stored on the sensor for over two weeks, which we’re sure is a feature that many will appreciate. This data is simply pushed to your phone or tablet when they are in range and is displayed in a nice, easy to read graph and numerically.
The addition of alerts is another much appreciated feature – you set the ranges when you be alerted so you know when there is a problem without having to constantly check the readings yourself.
Keep in mind that there is a slight trade-off, however. The readings aren’t quite as accurate as others, but they’re only off by a percentage point or two so there isn’t anything to really be concerned about. This also only applies to the humidity. We thought that you should factor this into your decision if you’re looking for the utmost accuracy.
The monitor is compatible with all iPhone’s 4 and beyond, iPad’s 3 and beyond, and iPad Touch’s 5 and beyond. Android devices are too numerous to mention, but if your device is at least somewhat modern then you should be fine.
The Extech 445815 is another model that makes the list of best hygrometers. It’s no surprise considering the range of features it contains.
It does what you would expect in the way that it records and displays humidity and temperature, but it also uniquely displays the dew point so you know when condensation will occur, which is certainly a welcome feature. Humidity seems to be accurate to +/- 3% and temperature to +/- 1.8 Fahrenheit or 1 Celsius, if you would prefer. The humidity range stands at 10% to 99%.
The triple display (temperature, humidity, and dew point) is nice and big, making it easy to ready from a distance. There is also an alarm that warns you both visually and audibly when the humidity level is higher than the point you have set, which is clearly beneficial for obvious reasons. You are also warned if the battery is running low.
There are two ways of placing the monitor, either via its built-in stand or mounted on a wall using the included bracket. There is also a remote probe that can handily be extended on an 18 inch cable for if you want to measure behind walls, or you can simply clip onto the meter.
2x AAA batteries are required for usage, and both minimum and maximum readings can be recorded and reset.
La Crosse Technology 302-604S
The last model on this list comes from La Crosse Technology. It is an inexpensive monitor that does everything right and also has a very nice design.
It measures both indoor temperature and humidity – temperature from -4°F to 122°F and humidity from 20% to 99%, with a handy Comfort Level icon that tells you that the room is in optimum humidity between 40-60%. Users report that both readings are accurate, but are a little slow to register – at least concerning the temperature.
The display is large enough to read from a distance, which is always good to see, and you can view minimum and maximum records within a manual 12/24-hour time frame.
You should keep in mind that the 302-604S is different to many other models in the way that it takes a single CR2032 battery. So you may want to purchase a spare battery when the one that is included runs out so you aren’t caught off-guard.
Hygrometer Buying Guide
What is a Hygrometer
Simply put, a hygrometer is an instrument that determines the amount of humidity in the air. Electronically powered devices are typically used to give a fast, relatively accurate reading of the humidity. These devices work by simply containing electrical resistance materials that change depending on the amount of moisture that is absorbed.
Hygrometers are used in a wide range of industries and professions. Examples include for meteorological purposes, inside industrial spaces and greenhouses, in saunas, incubators and museums, in the coating industry, for residential use to aid humidity control, and many, many more. Pretty much anytime someone needs to know how much humidity is in the air – however important or unimportant this may seem to us – a hygrometer is used.
Types of Hygrometers
There are several types, including metal/paper coil, hair tension, chilled mirror, and psychrometers. These are called classical hygrometers. Gravimetric, thermal, resistive, and capacitive are known as modern hygrometers.
Despite huge technological advances in all fields over recent years it is still notoriously difficult to get accurate measurements when it comes to measuring the amount of humidity. This is particularly true if you are looking for an inexpensive model to purchase. However, many do not realize that calibrating a hygrometer goes a long way in improving its accuracy. Calibration should at the very least be done once a year, even for the best hygrometers.
There are two ways of calibrating – via psychrometer calibration and saturated salt calibration. Considering that if you are reading this article you are likely using a hygrometer for home use you don’t need to concern yourself with psychrometer calibration. It is quite complex and requires the use of metal tubes anyway.
Saturated salt calibration is achieved by simply placing a hygrometer in a room that is not prone to temperature swings for 10 hours, in a sealed container next to a glass of salt water. After you have waited 10 hours, the it should read 75%, and then you know that it is properly calibrated.
Ease of Use
The most highly rated hygrometers are incredibly easy to install and use. If you have a spare battery at hand then you’re good to go, although many models come with batteries anyway. Just mount the device to a wall or place on a tabletop once batteries are inserted, and reading the humidity is as simple as glancing at the LCD screen.
Ideal Humidity Levels
According to the EPA (Environmental Protection Agency), the humidity should be below 60%. This is to prevent mold growth from occurring. Many homeowners aim for somewhere between 30-50% to be on the safe side. As mentioned, it can be hard to get an absolutely accurate reading and many go longer than they should without recalibrating the device, so some margin of error needs to be taken into account.
Humidity Levels Too High Fix
If a hygrometer informs you that the humidity is too high, you need to purchase a dehumidifier. This is because dehumidifiers work to remove moisture in the air. It’s common for dehumidifiers to also have a hygrometer built-in to the device and they are often more accurate than standalone models.
Factors to Take Into Account
Ease of Use & Functions
As mentioned, good hygrometers tend to be very easy to use, so this shouldn’t really be a concern. However, keep in mind that some models utilize an app on your phone or tablet that can be very beneficial for alerts when the humidity gets too low.
Typically, hygrometers are accurate to within +/- 3% when it comes to humidity.
Battery life tends to be similar across all models, lasting for approximately a year.
Do you prefer a model that sits on a tabletop or needs to be mounted to a wall? Many devices give you the option to do both, but some may not.
Most digital hygrometers are similarly priced. If you want to be alerted when the humidity level is low or are looking for a wireless model, be prepared to pay more, although still not that much more. Some people feel that the slightly higher price is therefore justified for the best hygrometers with this feature.