Availability
Handheld Hygrometers, Psychrometers & WBGTs
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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 -
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 -
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 -
Extech RH350 SuperHeat Psychrometer£124.80 £104.00- Dual Type K external temperature probe input
- Simultaneous display of %RH, Temperature and Dew point or Wet Bulb or External Probe Temperatures
- Built-in RS-232 interface (optional RS-232 cable) - uses Windows° Hyperterminal to download data to a PC
104 Reward PointsPrice Match GuaranteeRH350 -
Extech RH101 Hygro Thermometer + Infrared Thermometer£143.88 £119.90- Combination Humidity meter plus Infrared Thermometer features a super large backlit dual display
- Primary display is user selectable for IR or Humidity; Secondary always displays ambient temperature
- Infrared thermometer has built-in laser pointer and an 8:1 distance to target ratio
119 Reward PointsPrice Match GuaranteeRH101 -
Extech RH390 Precision Psychrometer (Humidity & Temperature Meter)£166.80 £139.00- Dual backlit display
- Simultaneous display of: Humidity/Temperature, Humidity/Dew Point or Humidity/Wet Bulb
- Data Hold and Min/Max functions
139 Reward PointsPrice Match GuaranteeRH390 -
Extech HT30 Heat Stress WBGT (Wet Bulb Globe Temperature) Meter£178.80 £149.00- Heat Stress Index measures how hot it feels when humidity is combined with temperature, air movement, and radiant heat
- Black Globe Temperature (TG) monitors the effects of direct solarradiation on an exposed surface
- In/Out Function displays the WGBT value with or without direct sun exposure
149 Reward PointsPrice Match GuaranteeHT30 -
Extech RH490 Precision Hygro-Thermometer£232.80 £194.00- Water vapor in GPP
- Simultaneous display of: Humidity/Temperature, Humidity/Dew Point or Humidity/Wet Bulb
- Data Hold and Min/Max functions
194 Reward PointsPrice Match GuaranteeRH490 -
Extech HD500 Psychrometer with Infrared Thermometer
£285.60 £238.00- Built-in InfraRed Thermometer for non-contact temperature measurement to 932°F (500°C)
- IR Thermometer: 30:1 distance to target ratio
- Type K Thermometer for contact temperature measurement to 2501°F (1372°C)
238 Reward PointsPrice Match GuaranteeHD500 -
Free UK DeliveryExtech HT200 Heat Stress Wet Bulb Globe Temperature Meter£342.00 £285.00- Measures exactly how hot it feels outside using many different measurements
- Calculates wet bulb globe temp, black globe temp, air temp, relative humidity, dew point and wet bulb
- Memory storage for up to 50 readings
285 Reward PointsPrice Match GuaranteeHT200
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.
