The 5 Best Digital Psychrometers: Ultimate Guide

The 5 Best Digital Psychrometers: Ultimate Guide

A psychrometer is an instrument used to measure the moisture content in the atmosphere. The device typically consists of two thermometers, one of which is covered with a wet wick or cloth.

Meteorologists and agricultural scientists typically use a psychrometer to measure humidity, dew point, and relative humidity. Homeowners can also use a psychrometer to detect water leaks in their homes.

When it comes to buying a digital psychrometer, it’s essential that you buy one that has been manufactured in accordance with national standards for accuracy. If you cannot find such a product on the market, make sure that you consult someone knowledgeable about psychrometers before buying.

UEi DTH35 Digital HVAC Psychrometer Testo 605i Fluke 971 Temperature Humidity Meter
UEi DTH35 Testo 605i Fluke 971

  • Relative Humidity from 0.1% to 99.9%

  • Data hold

  • Designed for in-duct measurement


  • Relative Humidity from 0 to 100 %

  • App for Android and iOS

  • Easy access to ducts


  • Relative Humidity from 5% to 95%

  • 99 record storage capacity

  • Backlit dual display

UEi DTH35 Digital Psychrometer – The Editor’s Choice

UEi DTH35 Digital HVAC PsychrometerThe UEi DTH35 Psychrometer is a valuable diagnostic tool for the HVAC/R industry. It is not just a thermometer but also measures humidity and wet bulb temperature. The data hold feature is useful for storing information while another reading is being taken.

The DTH35 has been designed to fit easily in one hand for ease of use and features a backlit LCD display with an ergonomic interface that is easy to operate.

Pros
  • Good back lighting
  • Easy-to-read from a distance
  • Probe cover functions as an extension for difficult to reach places
Cons
  • Made of cheap plastic

Testo 605i – The Best Psychrometer for Indoor Temperature and Humidity Measurement

Testo 605iThe Testo 605i Psychrometer is one of the most accurate psychrometers on the market. It has an easy-to-read LCD display and automatic temperature compensation. With 150-hour battery life, this psychrometer is perfect for professionals and amateurs.

The ability to integrate easily with your Testo devices makes it easier for you to gather a lot of useful data. With the free Testo Smart Probes App, you can download data from your device and create custom reports. The Testo 605i is the easiest way to monitor your home or workplace temperature.

Pros
  • Equipped with a bendable shaft
  • Provides accurate measurements of the temperature and humidity in your environment
  • This product includes everything you need to get started and will work right out of the box (with 3 AAA batteries)
Cons
  • The last update for this app was ago, and more than of users have uninstalled this app as a result

Fluke 971 – The Best Psychrometer for Casual Use

Fluke 971 Temperature Humidity MeterThe Fluke 971 Psychrometer is a portable, digital device for measuring and recording both humidity and temperature. It features backlit dual displays with a range of -20 to 60°C (-4 to 140°F). Users can measure dew point and wet bulb temperatures with 99 memory storage capacity, an ergonomic design with belt clip and protective holster, and more.

The Fluke 971 is your handy, go-to tool for fast and accurate measurement of indoor humidity levels. It’s fast and easy to use, with a capacitance sensor for quick response.

Pros
  • Fast response time
  • The belt clip and protective holster protect while maintaining comfortability
  • Min/Max/Avg Data hold included
Cons
  • It takes a few seconds to stabilize when it’s turned on

Extech RH350 – The Best Psychrometer with 2 Type K Remote Temperature Probes

Extech RH350 Psychrometer with 2 Type K Remote Temperature ProbesThe Extech RH350 is a digital data logger for psychrometric measurements. It can store up to 99 data records and has a two-line LCD with min, max, and average readings from the captured data as well as data hold and auto power-off features. The RH350 includes two type K thermocouple probes and four AAA batteries.

Find out the comfort level of your home environment with Extech’s RH350. This easy-to-use psychrometer is a selection for those either new to the study of heat transfer or for professionals who need a higher level of accuracy.

Pros
  • The readings are quick, accurate and allow for cost savings
  • Data logger included
  • Four AAA batteries included
Cons
  • T2 port is weak
  • Case is not included

Extech RHT510 – The Best Psychrometer Under $150

Extech RHT510 Hygro-Thermometer PsychrometerThe Extech RHT51 Psychrometer is the perfect instrument for anyone who needs to measure the temperature and humidity of their surroundings. Great for sports enthusiasts, medical professionals, greenhouses, and more. The backlit LCD provides easy reading in dimly lit areas, data hold, and min/max functions, and auto power-off with disable.

This acoustic sensor can measure the intensity of sound and the average exposure time to a certain noise and even measure the noise level. The device also has a Data Hold feature which will save data if the user needs to power down the device.

Pros
  • Compact design
  • Very easy to use
  • 3 AAA batteries included
Cons
  • Manual is not good
  • Mode indicator hard to see

The Buyer’s Guide

A digital psychrometer is a device that measures the dry-bulb temperature and the water vapor pressure in the air. This device is mainly used in building ventilation (humidity control, dehumidification, heating, cooling, and ventilating process).

How to Choose Quality Digital Psychrometer?

To choose a digital psychrometer for your needs, consider some factors. These are accuracy, type of sensors, and diagnostic capabilities. A good digital psychrometer should have all of these factors to ensure that you’re getting accurate readings of humidity levels.

How to Choose Quality Digital Psychrometer

What is a Sling Psychrometer?

The sling psychrometer is a device used to measure the humidity in the atmosphere.

The sling psychrometer consists of an upper half, called the capillary tube, and the lower half called the thermometer cell. It operates by measuring the relative humidity of atmospheric water vapor. The relative humidity is defined as the ratio of water vapor present in a given volume of air to that same air’s capacity to hold water vapor at its existing temperature.

What is Relative Humidity?

The relative humidity is the amount of water vapor present in the air compared to the maximum possible amount of moisture that could be present at a given temperature.

The relative humidity level indicates how likely it is for water to evaporate from a surface, including clothing and skin. If a garment’s relative humidity is low, then it is more likely to dry out and cool off. The relative humidity is essential as it affects both human comfort and environmental conditions such as fog and precipitation.

FAQ

Are digital psychrometers accurate?

Digital psychrometers are inaccurate because they do not have sensors in them, and there is no way to tell what the temperature or relative humidity is other than looking at the readout on the device.

Is hygrometer same as psychrometer?

A psychrometer measures the relative humidity of the atmosphere. It does this by measuring the dew point and dry bulb temperature of the air. On the other hand, a hygrometer is used to measure atmospheric water vapor content or relative humidity. It is often paired with a thermometer to measure temperature and a wet and dry bulb thermometer to measure evaporation or condensation.

The two devices are not interchangeable. They measure different things.

How does a digital psychrometer work?

A digital psychrometer measures the relative humidity of the air, which is an important indicator of fatigue.

A sensor measures the temperature and relative humidity. The air is drawn through a tube and moistened with water. The result is an easily readable value in percent.

How do you ensure the accuracy of a sling psychrometer?

Check that the psychrometer is in good working condition. Make sure the test area is clean and dry. Take the sling psychrometer reading with a thermometer nearby. Ensure that the psychrometer is calibrated at least once every 12 months.

What is also known as a psychrometer?

The psychrometer is known as a thermometer for the wind. It is used to determine the dew point.

The psychrometer is used to measure relative humidity. It contains a thermometer and hygrometer placed in an airtight container. The psychrometer also has three glass bulbs filled with water covered by wet cloths, called wicks or bulbs, which release heat and moisture into the air and gradually cool down. As humidity rises, the water inside of these bulbs will evaporate more quickly than when it’s dryer outside.

What is wet bulb depression?

Wet-bulb depression is a heat illness resulting from being exposed to high levels of humidity and high temperatures.

How do you use an HVAC psychrometer?

The psychrometer can be used for many different reasons, such as monitoring indoor environments, monitoring the quality of air in office buildings, and much more. A basic psychrometer only requires four measurements of relative humidity: dry bulb temperature (the temperature of an object immediately after it has been cooled or heated), wet bulb temperature (the same as dry bulb but exposed to evaporating water), relative humidity (RH) (percentage of moisture content in the air), and actual vapor pressure (AP).

What is another name for a sling psychrometer?

A sling psychrometer is sometimes called a whirling hygrometer.

How often should you replace the wick on a sling psychrometer?

The wick should be replaced every six months when not in use or after about a month.

Who invented the sling psychrometer?

Adolph Richard Assmann invented the sling psychrometer in the 19th century. It is a device for measuring the dew point, humidity, and air temperature.

What is a psychrometric chart in HVAC?

A psychrometric chart is a graph of temperature and humidity. The diagram is usually plotted on two axes, one being the saturation heat capacity and the other being the relative humidity.

A psychrometric chart helps predict how much water is needed to balance out a hot air stream at different temperature and humidity levels.

A psychrometric chart can be used to calculate the relative humidity, dew point, or wet-bulb temperature of an airstream in order to decide what type of humidifier is required for cooling purposes.

Related Video: Using a Sling Psychrometer

Final Words

In conclusion, digital psychrometers are a great way to measure one’s body temperature and have many features that make them significantly better than other digital psychrometers. Hopefully, you found this article informative and a good source of knowledge.