Availability
Manufacturers
Handheld Hygrometers, Psychrometers & WBGTs
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ETI 810-190 Pocket-Sized Hygro-Thermometer£25.20 £21.00- Dual capabilities - simultaneously measures air temperature and humidity
- Portable, handheld and pocket-sized design
- MAX/MIN measurement mode calculates maximum and minimum values over time
21 Reward PointsPrice Match Guarantee810-190 -
Extech 44550 Pocket Humidity/Temperature Pen£30.00 £25.00- Pen-shaped
- Measures RH and temperature at same time
- Pocket sized
25 Reward PointsPrice Match Guarantee44550 -
Sauermann Kimo K-SiHH3 Thermo-Hyrgrometer£56.34 £46.95- Magnetic backing for easy fixing
- Backlit LCD screen
- Carrying bag
46 Reward PointsPrice Match GuaranteeK-SiHH3 -
Extech 445580 Humidity/Temperature Pen£59.99 £49.99- Simultaneous display of Temperature (°C/°F) and Relative Humidity
- Max/Min and Data Hold
- Built-in self calibration utility allows for field calibrations using optional Relative Humidity calibration bottles
49 Reward PointsPrice Match Guarantee445580 -
Extech RH300 Hygro Thermometer Psychrometer£80.34 £66.95- Wet bulb measurements without slinging
- Calculates T1-T2 differential (Air Temperature-External Probe Temperature) using optional probe
- Unique sensor cap design twists to closed position for protection during storage
66 Reward PointsPrice Match GuaranteeRH300 -
Beha-Amprobe TH-1 Temperature/Relative Humidity Meter£94.32 £78.60- Simultaneously measure air temperature and humidity
- Compact design
- Data hold and MIN/MAX functions
78 Reward PointsPrice Match Guarantee3311871 -
Testo 605i Advanced Bluetooth Thermohygrometer Smart Probe£100.98 £84.15- Bendable probe head
- Bluetooth range: up to 100m
- Designed for use with a smartphone/tablet with the Testo Smart Probe App installed
84 Reward PointsPrice Match Guarantee0560260502 -
ETI 224-655 6500 Therma-Hygrometer with Fixed Remote Sensor£102.00 £85.00- Measures both temperature and humidity levels
- Flexible sensor attached via 1m PVC lead
- Calculate dewpoint, MAX/MIN temp/humidity and more
85 Reward PointsPrice Match Guarantee224-655 -
Testo 605-H1 Thermo-Hygrometer£104.04 £86.70- Long sensor probe for duct work
- Measures ambient air temperature and humidity
- Also calculates dew point
86 Reward PointsPrice Match Guarantee5606053 -
ETI 6000/6100 Therma-Hygrometer£108.00 £90.00- Two versions available - one with built-in sensor, one with removable external sensor
- Measure temperature and humidity levels with a high degree of accuracy
- Dewpoint, MAX/MIN and data hold functions
90 Reward PointsPrice Match GuaranteeETI-6000-6100 -
TPI SP597 Smart Wireless Temperature & Humidity Probe c/w A597SP Pouch - Optional Pair of SP597s
£110.39 £91.99- Humidity Range: 0 to 100% RH
- Includes A597SP Pouch
- Temperature Range: -4 to +140 °F (-20 to +60 °C)
- Single or pair of SP597s
91 Reward PointsPrice Match GuaranteeTPI-SP597-2 -
Extech RHT510 Humidity and Temperature Meter£118.80 £99.00- Compatible with a range of probes
- Suitable for residential and professional settings
- Easy to use
99 Reward PointsPrice Match GuaranteeRHT510 -
ETI 6002 & 6102 Dual-Display Therma-Hygrometer with Backlight£120.00 £100.00- Simultaneously measures temperature and humidity
- Available with integrated sensor, or removeable sensor on flexible lead
- Backlit LCD screen
100 Reward PointsPrice Match GuaranteeETI-6002-6102
About Handheld Hygrometers, Psychrometers & WBGTs
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, the 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 to ensure the safety of yourself and your workforce.
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, a 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 |
Flashover, dielectric damage |
Shorts fungus; corrosion of contacts lowered insulation resistance |
|
Crystals |
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 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 it's 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.
