Hygrometers & Humidity Meters (81 Products)

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  1. UNI T UT331 Digital Thermo Hygromet
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    UNI-T UT331 Digital Thermo-Hygrometer
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    £29.17 £24.31
    • Two-in-one: measures both humidity and air temperature
    • Datalogging capabilities - stores up to 100 records with USB transfer
    • Portable, handheld design
    48 Reward Points
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    SKU: UT331
  2. Extech 445702 Hygro Thermometer Clock
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    Extech 445702 Hygro Thermometer Clock
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    £29.95 £24.96
    • Triple LCD display shows time, temperature and humidity levels at the same time
    • Can be placed on a desk or wall mounted
    • User-settable clock alarm
    48 Reward Points
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    SKU: 445702
  3. Comark DTH880 Combined Humidity Meter & Thermometer
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    Due In: 1-6 Days
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    Comark DTH880 Temperature and Humidity Monitor
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    £35.62 £29.68
    • Portable monitor which measures air temperature and humidity levels
    • Mount on a wall, or prop up on a surface with the built-in stand
    • Ideal for any environment - offices, greenhouses, warehouses and anywhere else
    58 Reward Points
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    SKU: DTH880
  4. Extech 445814 Hygro Thermometer Humidity Alert with Dew Point
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    Extech 445814 Humidity, Dewpoint and Temperature Alert
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    £38.39 £31.99
    • Constantly calculates and displays air temperature, humidity and dewpoint
    • Set your own alarms - the indicator will flash a light and sound a beeper when limits are met
    • Wall-mountable (bracket included) or can be propped up using built-in stand
    62 Reward Points
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    SKU: 445814
  5. Extech HW30 HeatWatch Humidity Temperature Stopwatch 1
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    Extech HW30 HeatWatch Humidity/Temperature Stopwatch
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    £39.30 £32.75
    • Stopwatch/chronograph mode with 1/100 second resolution
    • Fastest/Slowest/Average Lap recall
    • 99 lap counter with 30 lap/split memory
    64 Reward Points
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    SKU: HW30
  6. Extech 445815 Hygro Thermometer Humidity Alert with Dew Point
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    Extech 445815 Temperature, Humidity & Dew Point Alert w/ Remote Sensor
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    £39.60 £33.00
    • Monitors air temperature, humidity and dewpoint and constantly displays values
    • User-programmable humidity alarms with visual LED and audible beeper when limits are exceeded
    • Flexible remote sensor fits into small gaps (such as behind walls) or can be clipped onto the indicator
    66 Reward Points
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    SKU: 445815
  7. Extech 445703 Big Digit Hygro Thermometer Angled
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    Extech 445703 Big Digit Humidity & Temperature Indicator
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    £40.26 £33.55
    • See the air temperature and humidity in your greenhouse, office, factory or wherever else you need it
    • Completely wall mountable (includes bracket) or can be propped up on tilt stand
    • Extremely large display shows temp/humidity at same time and refreshes constantly
    66 Reward Points
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    SKU: 445703
  8. extech 445713 big digit indoor outdoor hygro thermometer
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    Extech 445713 Big Digit Indoor & Outdoor HygroThermometer
    Rating:
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    £41.21 £34.34
    • Humidity: 10 to 99% RH
    • Temperature: 14 to 140°F or -10 to 60°C
    • Accuracy: °5%RH; °1.8°F, °1°C
    68 Reward Points
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    SKU: 445713
  9. Extech RH200W Multi-Channel Wireless Hygro-Thermometer - Kit
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    Due In: 1-6 Days
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    Extech RH200W Multi-Channel Wireless Hygro-Thermometer
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    £46.40 £38.67
    • Consist of one base station and one wireless transmitter
    • Up to eight transmitters can be wirelessly connected to the base station
    • Base station indicates all temperature and humidity readings and can record the min and max values detected over the measurement period
    76 Reward Points
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    SKU: RH200W
  10. Extech 445715 Humidity Alert with Remote Probe
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    Extech 445715 Humidity & Temperature Indicator w/ Remote Sensor
    Rating:
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    £47.76 £39.80
    • Constantly monitors temperature and humidity levels
    • Ideal for greenhouses, offices, factories and much more
    • Large-size LCD display for viewing at a distance
    78 Reward Points
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    SKU: 445715
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About Hygrometers & Humidity Meters

Our environment is made of several different elements. While we generally think of oxygen, carbon dioxide and even nitrogen as forming the bulk of the Earth's atmosphere, water content in the air is also constantly present.  A good quality humidity tester is useful for those who routinely find themselves working in humid environments.

If you've got a lot of people working in one place, keeping the humidity in check is essential. Many people become uncomfortable in humid environments and can even suffer adverse health effects if they are exposed for long enough periods. Asthmatics are particularly affected by humid environments.

It is therefore important for you to regularly test the humidity of an environment in order to ensure the safety of yourself and your workforce. Tester's range of humidity testers come from industry-leading suppliers around the globe, providing excellent readings and testers that don't break the bank due to our low prices.

High humidity, along with temperature, also affects electronic circuits and machinery, so if you want to keep your installation working within safe limits a hygrometer will be a worthwhile investment. Here are some of the effects you can expect:

Component

Temperature Effect

Humidity Effect

Ceramic capacitors

Changes in dielectric constant and capacitance, lowered insulation resistance with high temp.

-

Electrolytic capacitors

Increased electrolyte leakage; shortened life, large change in capacitance, increased series resistance with low temp.

Decreased insulation resistance increased dielectric breakdown increase in shorts

Tantalum Capacitors

Electrolyte leakage; change in capacitance insulation resistance; series resistance

Decreased insulation resistance increased dielectric breakdown increase in shorts

Transistors

Increased leakage current; changes in gain; increases in opens and shorts

Increased leakage current; decreased current gain , if sealed not effect

Standard Connectors

Flash over, dielectric damage

Shorts fungus; corrosion of contacts lowered insulation resistance

Cyrstals

Drift

Drift

Switches

Oxidation of contacts

Contact arcing

Thermistors

Increased shorts and opens

Change in resistance

Humidity sensors are also quite commonly referred to as hygrometers. These devices are generally defined into two separate types - humidity meters and humidity sensors. The major difference between the two is that humidity meters are designed as handheld, portable instruments to be carried out and test various different applications; a humidity sensor is designed to be mounted in one location such as a wall and will constantly catalogue the humidity (and other parameters such as temperature) in the environment it is placed in.

A humidity sensor is an extremely beneficial tool in a wide variety of applications. Whether its simply maintaining the humidity levels in an office or ensuring that excessive water content isn't in the air when storing delicate materials such as wood, these sensors help to alert users when humidity is too high and action must be taken.

Many humidity meters include the ability to measure dewpoint, which is basically when water vapour in an area starts to condense into liquid water. By determining this value users can ensure that humidity in the air doesn't get the chance to turn into water, and this in turn increases safety and stops damage to properties and components.

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