Best Psychrometer Review

If you are reading this article on best psychrometers, then you must be an HVAC engineer or a person who got interested in knowing atmospheric humidity, or a simple hobbyist gardener. Your interest in psychrometers is justified, as they consider a variety of things for measuring the humidity that a regular weather forecaster won’t provide.

Psychrometers come in different forms, such as analog, digital, and sling. Apart from these three types, digital psychrometers are the easiest to use. They are portable, provide faster and better accuracy.  

Therefore, in this article, you are going to encounter six best digital psychrometers that can fit your needs.

Our Favorite Psychrometer

Last update on 2021-05-24 / Affiliate links / Images from Amazon Product Advertising API

What is a Psychrometer?  

As complicated as it sounds, a psychrometer is basically a simpler form of hygrometer and is an atmospheric tracking device. Psychrometers are portable and easy to use by anybody, unlike hygrometers which are required for professional use. Psychrometers provide direct reading through the use of its two types of thermometers:

  • A dry bulb thermometer: it is used to measure the relative atmospheric humidity when exposed to the air
  • A wet-bulb thermometer: measure the temperature by dipping the bulb in the liquid.

In simpler words, a psychrometer is a tool for measuring humidity levels in the air. Psychometrics has two different bulbs, a wet and a dry. The difference in reading in these two bulbs is the atmospheric humidity. As the difference tells us that the atmosphere has lost some of its moisture via evaporation.  

Psychrometer measures the relative humidity unit in RH.  

Types of Psychrometer

Psychrometers are instruments that measure humidity and temperature. There are two types of psychrometers they have different ways to measure these components but they will both give you accurate readings as long as you know how to use them.

Let’s learn about them:

1. Sling Psychrometer

An inexpensive and easy way to easily and quickly measure relative humidity is the Sling Psychrometer. These sensors are ideal for a number of different applications, such as observing indoor conditions, storing objects, and measuring temperatures in laboratories.


  • RH can be measured quickly and accurately for a variety of applications.
  • Operation and reading of measurements are simple.
  • The device is designed to be portable and compact.

2. Digital Psychrometer

Digital psychrometers are surprisingly easy to use. Calculation can be done in a few minutes without waving the psychrometer around. By pushing a button, everything is automatic. This makes it easier to use a psychrometer and makes the process much faster for those who need one.


  • Digital psychrometers offer more data and allow for greater calculations.
  • In just a few seconds, you can find the relative humidity, dew point, and temperature in the air.
  • You can calculate the difference in temperature between the two bulbs (dry and wet).
  • You can store data of your readings, including maximum and minimum readings, which you can compare on a regular basis.

6 Best Psychrometers: Comparison Table

Preciva Digital Psychrometer Thermo-HygrometerRequires 9 volts batteryFor practical daily usageMade from imported sensors  
Fieldpiece PRH2 Digital Psychomotor  Pen-style psychrometerNarrow tip for inspectionRequires AAA battery  
ERAY Temperature and Humidity Gauge Meter  Measure temperature and humidityBattery power: 9V batteryAuto-power off technology  
Mengshen Digital Psychrometer  Power source: battery-poweredResponse time: 10 secondsMade from ABS plastic  
UEi Test Instruments DTH35 Digital Psychrometer  1-year warrantyTriple display function ·        Min/ Max data hold  
Lancoon Digital Psychrometer  Temperature and humidity measurementPower source: 9V battery10 seconds response time  

Review of 6 Best Psychrometers-2021

1. Preciva Digital Psychrometer Thermo-Hygrometer

Preciva Digital Psychrometer Thermo-Hygrometer, LCD Mini Temperature and Humidity Meter with Dew...

If you are looking for a beginner and budget-friendly psychrometer, then no doubt you’re reading about the best of them all. The preciva digital psychrometer is perfect to use for indoor room humidity measurement, whether you are in the home, office, lab. You can carry it along with you due to its small, compact size. 

The psychrometer also effectively provides the most accurate reading just as a professional hygrometer. It also works in rooms that have rusted materials inside. This battery-run psychrometer will be a great investment overall.

Key features:

  • Has LCD display
  • Requires 9 volts battery
  • For practical daily usage
  • Made from imported sensors
  • Rubber button control


Battery: The meter requires only a 9 volts battery for running with all the specs. The battery also has power-saving technology with its auto shut-off feature.

Comfort: The intuitive rubber buttons provide comfortable use of the meter. Also, you can view the LCD screen in dim or no-light conditions as it is backed up by a backlight that lights up automatically in such conditions.

Ease-of-use: With the clear and large LCD screen, you can easily read the readings. And the screen shows some other related readings, such as dew-point temperature, wet and dry bulb temperature, etc. There are just three buttons for specific purposes so you won’t get confused.


  • Very affordable
  • Comfortable and easy to use
  • Has auto shut-off to save battery
  • Provides accurate measurements


  • Not for outdoor, sun-exposed use

2. Fieldpiece PRH2 Digital Psychomotor

Fieldpiece PRH2 Digital Psychomotor

The second one is a Fieldpiece digital psychrometer, which is as compact and slim as a pen. It means you can carry it in your pocket and readily use it to measure out the air humidity level. The tool is not only convenient to fit in your pocket but budget-friendly too to fit within your pocket.

This pen-style digital psychrometer has versatile usage for duct inspection works for its narrow tip. The most interesting feature of this fieldpiece psychrometer is that its single battery power lasts more than 100 hours of usage. However, to read through that mini digital display, you need to have good eyesight even though it provides a backlight.  

Key features:

  • Pen-style psychrometer
  • Narrow tip for inspection
  • Requires AAA battery
  • Made from plastic
  • A bright backlight in the LCD screen


Battery: The battery used in this meter is a regular AAA battery that you can easily get in any departmental store. Moreover, one fully-charged brand-new battery will last up to 100 hours of usage.

Uses: This meter will be the best choice if you are looking for an entry-level psychrometer. You can use it for basic air humidity detection, and its narrow tip provides easy in-duct testing. 

Convenience: The pen-style meter has a small LCD screen from where you can easily read out the readings it gives. In dim light-condition, a bright backlight in the screen lit up to help you out. Lastly, you can carry it in your pocket like a pen.


  • Very convenient to carry
  • Has sensor protecting caps
  • Batteries are long-lasting with one charge and can be found easily
  • Easy to read screen with bright backlight
  • Affordable


  • Screen is small

 3. ERAY Temperature and Humidity Gauge Meter

ERAY Temperature and Humidity Gauge Meter with Backlight Digital Psychrometer Thermometer...

Those who want a psychrometer for high professional reasons can try out buying this 2-in-1 temperature and humidity meter. This meter will provide a wide array of features that makes it usable starting from industry, agriculture, meteorology, paranormal investigation to basically everything.

Although it is a bit costly, the convenient and high-profile usage makes all the money worth it. It runs with a 9-volt battery that covers all the features, including a large and crisp LCD screen to read out everything clearly. This meter from ERAY will blow your mind out with all the specifications it provides.

Key features:

  • Measure temperature and humidity
  • Battery power: 9V battery
  • LCD screen: 1.49 inches dual-display
  • Auto-power off technology
  • Bright backlight for low light condition


Convenience: With the dual-screen display, you can have a sharp and clear view of the readings. Moreover, the rubber push button allows more easy control over the readings. You can turn it on/ off with the comfortable rubber button for this purpose.

Usage: You can use the meter for temperature and humidity tracking in any place, whether it is your home, office, factory, agricultural land, etc. Tracking in the night time with this meter is effortless due to its bright backlight in the display/

Battery: This meter includes a 6F22 9V battery to run with all the features. Both temperature and humidity can be tracked without the loss of power. Moreover, the meter auto shuts off after 15 minutes of remaining idle, so it saves on battery power.


  • Has double usage in a single tool
  • Easy to control
  • Clear view with the dual-display
  • Has a wide array of usages


  • Not convenient to carry

4. Mengshen Digital Psychrometer

Mengshen Digital Psychrometer - Handheld Backlight Temperature Humidity Meter Gauge with Dew Point...

The fourth best psychrometer on our list is a digital one from Mengshen. Even though it is compact and sleek, but it is built for professional use. It has enough features and is built rigorously to meet all the expectations of professionals like HVAC engineers.

Not just it is a portable psychrometer, but time-saving too, as it has the fastest response time compared to its competitors. This battery-powered meter has a high range of temperature and humidity reading units. Though it looks sleek, it has a weight that makes it feel tough and can survive falls.

Key features:

  • Power source: battery-powered
  • Response time: 10 seconds
  • Made from ABS plastic
  • Reads both temperature and humidity
  • Weighs 10.6 ounces


Uses: The meter has reading capability for both temperature and humidity in many measurement units. You can use this handheld, portable meter in your home, office, factory, lab, greenhouse, and any other indoor areas.

Convenience: This meter from mengshen is the most responsive one with accurate measurement reading. It takes merely 10 seconds to respond and provides a wide array of unit range to make it understandable, such as temperature for -30 to 100 degrees celsius and humidity for 0 to 100% RH.

Display: The meter has a sharp LCD screen for showcasing the readings. You can turn on the backlight to read in dim light condition.


  • Portable, yet durably made
  • Has fastest response time
  • Can be used for wide applications
  • Easy to monitor and read with backlight LCD screen


  • The battery is hard to find in the market

5. UEi Test Instruments DTH35 Digital Psychrometer

UEi Test Instruments DTH35 Digital Psychrometer

If you are looking for a premium-quality in-duct measurement humidity and temperature psychrometer, then we have this one from Uei in our fifth position. It is a high-quality built, handheld, and multipurpose digital psychrometer that one can buy.

It provides so many measurement units, so don’t get perplexed. With the long probe and display merged together, it becomes a quality HVAC psychrometer you can have. Unlike any probe-based meter, this one does not require water to do the measurements. 

Key features:

  • Has in-duct measurement design
  • 1-year warranty
  • Triple display function
  • Min/ Max data hold
  • Measures both temperature and humidity


Uses: It is a two-in-one psychrometer that can measure temperature and humidity in different ranges of units. The probe design is for in-depth duct measurement of the relative humidity and temperature with wet-bulb, enthalpy, and dew point. 

Convenience: Using this sleek meter is quite easy and you can carry it along with you in your pocket. It runs with a pair of CR2 batteries which supplies enough power to use it for hours at once.

Display: The triple display provides accurate and large font reading. The display is built-in with the probe and large enough for comfortable viewing without pressurizing the eyes. You can turn on the backlight in dim or low-light conditions for accuracy.


  • Handheld and portable
  • Has wide temperature and humidity measurement range
  • Easy to read and monitor with triple display
  • Provides consumer satisfaction warranty


  • Very expensive

6. Lancoon Digital Psychrometer

Lancoon Digital Psychrometer - Handheld Thermometer Hygrometer Temperature Humidity Meter with Dew...

The last digital sling psychrometer is from lancoon with greater benefits at such an affordable price. This meter can be used by both amateurs and professionals for its multi-functioning and comfortable features. Apart from these, their portability and built are just similar to any high-end digital psychrometer.

Moreover, it has a wide variety of uses for home, HVAC, greenhouse, warehouse, and much more. You can adjust its display’s backlight and convert its reading according to your comfort in this meter. All over, you cannot go wrong with such a beneficial digital psychrometer. 

Key features:

  • Has unit conversion feature
  • Temperature and humidity measurement
  • Power source: 9V battery
  • Has data storage
  • 10 seconds response time


Uses: Uses of this meter are based on two types, one is for measuring relative humidity and the other is atmospheric temperature. Both professionals and beginners can use it as an easy to use interface with a few rubber buttons. The meter is for both indoor and outdoor usage which is a huge plus point. 

Convenience: This psychrometer is filled with convenience as you can convert the temperature reading from Celsius to Fahrenheit and vice-versa. This enables a wide variety of users to understand the measurement unit. The display is small, but you can always turn on the backlight and adjust it as long as the readings don’t fit in your eyes.

Battery: You can enjoy all the features of this meter with only a 9V battery. Moreover, the superior auto shut-off feature helps to save battery if the meter is sitting idle for a specific time.


  • Has fastest response time
  • Auto power shut-off saves battery
  • Includes a manual for easy use
  • Has multi-purpose usage
  • Affordable


  • Display is small

Buying Guide for Best Psychrometers

So, now that you have come across the best psychrometers in the market, it is time to buy one. But how would you know which one is the right psychrometer for you? Let me make it easy for you to pick up one in this buying guide.

Uses: Though psychrometers are mainly bought for measuring relative humidity, there are ones that have multiple usages apart from measuring humidity. So, you can purchase a multi-purpose meter if your job requires other uses too.

Also, there are some meters that are sun-sensitive and are meant for interior use only, so if your work is outdoor-based, then look out for such ones.

Display: Display plays a big role as it holds all the results of your findings. Choose a display with accurate and precise readings. Choose the display that has a backlight in it so that you can read them in low-light conditions. Also, if you have an eye-sight problem, look out for bigger LCD screens for comfortable reading.

Convenience: Convenience depends from person to person, how one finds comfort from using the meter. Still, look for portable, lightweight, and handheld meters so that you can carry them easily. Moreover, having a battery that is self-power-saving with auto turn-off is also a convenient feature to enjoy.

Price: The price of a psychrometer can be as high or as affordable depending on the features it consists of. The meter with more high-profile features for professional uses will cost more. So, if you are looking for an entry-level meter, you have to give up on some features as they cost less. 


  • What is a digital psychrometer used for?

In addition to measuring temperature, relative humidity, and calculating wet bulb and dew point, a digital psychrometer also measures the enthalpy of moist air (air with a high humidity level).

  • How does a psychrometer measure humidity?

The relative humidity of air can be determined with a sling psychrometer, which calculates it as a percentage. The moisture content in the air when it is at a given temperature is computed by multiplying it by a factor of the maximum amount of moisture the air could contain at that temperature, and then multiplying the result by 100.

  • What are the main parts of a psychrometer?

Dry bulb thermometers and wet bulb thermometers are the main components of a psychrometer.

  • How is a psychrometer measured?

A psychrometer. Psychrometers measure humidity by taking both wet-bulb and dry-bulb temperatures. Using these two values, one can calculate or read a psychrometric chart to figure out the other properties of the air.

Final Verdict

I want to finish off the article with a final note that psychrometers won’t be a worthless purchase if your job requires it to buy. However, you need to choose amongst the best to enjoy their full benefits. Nowadays, in the digital era, digital or electronic psychrometers are the best choice as they offer so many extra benefits to relish. From my reviewed list of six best psychrometers, you can pick up anyone that meets your demand.

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