8 Best Humidity Monitors | December 2016

8 Best Humidity Monitors
Best Mid-Range
Best High-End
Best Inexpensive
Ideal for gardeners who need to keep their flowers and plants at precise levels, and for reducing the risk of mold in potentially damp basements, these humidity monitors provide accurate tracking of moisture in the atmosphere. Skip to the best humidity monitor on Amazon.
The AcuRite 613 comes as a pack of 2 monitors. In addition to measuring humidity, they display indoor humidity comfort levels and daily highs and lows. They even work well in cool areas, like basements.
  • magnet backing makes them easy to place
  • devices are very portable
  • data is not always reliable
Brand Chaney Instruments
Model pending
Weight 3.2 ounces
Rating 3.7 / 5.0
Including a battery-powered wireless sensor with a 300-ft range, the La Crosse Forecast Station is ideal for getting real-time weather data. Plus it has an appealing design, with colorful visual displays and an adjustable backlight.
  • auto adjusts for daylight savings time
  • predicts atmospheric pressure
  • monitor is hard to read during the day
Brand La Crosse Technology
Model S88907
Weight 1.7 pounds
Rating 4.1 / 5.0
In addition to measuring relative humidity, the Amprobe THWD-5 can measure other environmental factors, like wet bulb temperatures and dew point. The humidity sensor has a large range, too, from 0 to 100 percent.
  • is tripod mountable
  • carrying case included
  • slow response time
Brand Amprobe
Model THWD-5
Weight 2.3 pounds
Rating 4.2 / 5.0
The AcuRite 06016RM is a one-stop device for all of your weather information, providing readings on wind speed and direction, and rainfall. It even gives "feels like" temperature calculations, so you can plan your wardrobe.
  • displays moon phases
  • mains powered with a battery option
  • includes a one-year warranty
Brand AcuRite
Model 06016RM
Weight 1.5 pounds
Rating 4.2 / 5.0
The Extech 445815 includes several advanced features, like audible alarms that warn you when humidity levels are too high or too low, a probe that measures humidity in hard-to-reach places, and recall of minimum and maximum readings.
  • ideal for areas susceptible to mold
  • includes condensation predictions
  • no calibration certificate included
Brand Extech Instruments
Model 445815
Weight 7.2 ounces
Rating 4.5 / 5.0
The Caliber IV is bright enough to read through the glass of a humidor, and includes a self-adhesive magnet so you can put it anywhere. It comes out of the box pre-calibrated, so you know it's displaying the correct information.
  • monitor has a simple design
  • the battery is included
  • great for continuous regular use
Brand Cigar Oasis
Model pending
Weight 1.6 ounces
Rating 4.8 / 5.0
The Inkbird Hygrometer is light and portable, so it's great for the traveler who wants to measure the humidity in constantly changing surroundings. It even fits in a guitar case, and has Fahrenheit and Celsius capabilities.
  • sleek design uses a small coin battery
  • perfect for string instrument musicians
  • affordable price for a quality device
Brand Inkbird
Model pending
Weight 0.3 ounces
Rating 4.9 / 5.0
The Indoor CO2 can measure information on the air quality in your home, office or greenhouse, so it's perfect for a gardener. It also continuously monitors the carbon dioxide levels, which can tell you if heat or AC is being wasted.
  • plugs directly into a wall outlet
  • convenient size fits on any desk
  • self-calibrating for accuracy
Brand CO2Meter
Model TIM10
Weight pending
Rating 4.6 / 5.0

Buyer's Guide

How Modern Humidity Sensors Work

Humidity simply means the presence of water in the air, and various humidity sensors measure that presence in different ways. Because it is difficult to isolate the water content in the atmosphere, each type of sensor measures some other co-existing quality in the air, like pressure or electrical charge. A capacitive humidity sensor works by monitoring the electrical capacity of a strip of metal oxide. The strip is placed between two electrodes, and when there is a change in atmospheric humidity, the electric charge on the metal oxide alters.

Thermal conductivity sensors are made up of two sensors, one of which sits in dry nitrogen, while the other is exposed to ambient air. The difference between the two sensors’ ability to conduct electricity is an indicator of humidity. Thermal sensors measure absolute humidity rather than relative humidity. Relative humidity is the ratio of water in the air to the amount of water that could be in the air at the current temperature. Relative humidity plays a large role in how comfortable humans feel in certain climates.

Resistive humidity sensors use the ions in salt to achieve their measurements. When there is a change in humidity, there is an adjustment in the resistance of the electrodes on either side of the salt. Resistive varieties sometimes use conductive polymers instead of salt; regardless of the material involved in measuring electrical resistance, these models typically need to be paired with a temperature sensor to achieve accurate results.

Gravimetric sensors use mass to measure humidity. These sensors compare the mass of an atmospheric air sample to that of an equal volume of dry air. Weather experts consider this the most accurate method of determining humidity. The United States, The United Kingdom, The European Union and Japan established national standards based on gravimetric measurements.

What Can Happen When Humidity Is Too High Or Too Low

Humidity can affect human comfort, which is one of the reasons the weather report lists it each day, but it can also do much more than that. Proper humidity levels in greenhouses are crucial to ensuring optimal growing conditions for crops. Most plants hold and move water through their tissues; it is taken up by the roots and sent out through the leaves into the air. This process — called transpiration — is important to cooling a plant down. When humidity levels in the air are too high, transpiration happens slowly and that can harm the plant.

Musicians often use humidity sensors to monitor the environment of their instrument. When humidity rises, the wood in items like violins and guitars expands. During times of high humidity, musicians find it difficult to tune their instruments because the wood around the pegs has swelled, making them too tight. Reversely, if humidity levels drop, the wood of an instrument can shrink, causing tuning pegs to become too loose, and difficult to keep in place.

Humidity is important in spas, gyms and country clubs because these venues typically contain saunas. While the temperature inside of a sauna can rise to 90 degrees, it remains comfortable because the humidity levels are kept low. Most people have experienced this phenomenon in natural locations, too; walking through the desert can be more comfortable than traversing a rain forest, even if the temperatures are the same because the latter has high humidity levels. Businesses that operate steam rooms try to keep the humidity levels up to 100 percent inside of these environments, which is why condensation builds up on the walls. Both of these climates — dry and humid — offer health benefits, but only for short periods of time, which is why warnings are posted outside of each, with suggested usage.

Additional Data Found On Humidity Sensors

Modern humidity sensors can report several pieces of information about the environment. Countless systems run through and around your home, interacting with both the climate inside of your walls and outside of them. If they build condensation, retain too much moisture or freeze, they can fail to work properly.

Some sensors display the dew point — the temperature at which water vapor turns into liquid. An instance in which one can observe this happening is when ice on a window melts into water. That water can sink into the window pane, causing the wood in it to expand and warp. Wood warping can cause problems for the structure of a home. Frost point also appears on many sensors and is the temperature at which water vapor in the air turns into ice. Monitoring the frost point can help prevent issues like frozen pipes. Consider a sensor with alarms that alert you when humidity levels are too high or too low.

People who live in highly polluted areas can benefit from sensors that analyze air quality. Some sensors report the carbon dioxide levels in the air, which can help one determine if air conditioning or heating is escaping. A humidity sensor can also be built into an all-in-one weather reporter, which displays daily highs and lows, humidity comfort levels and local forecasts.

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Last updated on December 15, 2016 by multiple members of the ezvid wiki editorial staff

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