Humidity meter and hygrometer guide

Humidity meters, hygrometers and therma-hygrometers - a guide. In many manufacturing processes the measurement of relative humidity (%rh) is important, as many products are sensitive to variations in humidity. Therefore humidity needs to be measured and controlled for the end products to be consistent in both quality and performance.

what is a hygrometer?
A hygrometer is an instrument used to measure the quantity of water vapour present in air. Hygrometers can measure relative humidity over the range of 0 to 100 %rh but in most instruments, this range may be more limited depending on the sensor type. Relative humidity is expressed as the ratio of the amount of water vapour present in the air or gas, to the quantity which would reach saturation, saturation being 100%.

There are a wide range of applications for %rh measurement in the following industries:
paper mills
food processing
computer rooms
electronic component production
building & construction

The pharmaceutical industry is one of the largest users of humidity instrumentation as products can be sensitive to variations in humidity levels. Food manufacturing processes rely on humidity control, as food preservation techniques are often focused on limiting the activity of water. The humidity is an essential element of climate control in buildings for optimum comfort and energy conservation. Paper and paper based products are highly sensitive to humidity and moisture levels. During production, storage and distribution, the monitoring of humidity can have significant benefits on quality.

monitor humidity levels for better health
If a building is too damp and the humidity level is too high at above 70%rh, not only does mould develop but it can encourage dust mites to breed in carpets and mattresses. Conversely, if the humidity level is too low at below 25%rh, it can cause respiratory discomfort. The regular monitoring of humidity levels in buildings can improve health.

dew point
The dew point is defined as the lower temperature to which air must be cooled in order for condensation (saturation) to occur. The dew point is dependent on the concentration of water vapour (%rh) present.

UKAS Certificates of Calibration
ETI's in-house UKAS calibration laboratory offers certification for both temperature and humidity instruments. Each certificate indicates deviations from standards at various temperature or humidity check points.

  • ETI 6100 / 6102 therma-hygrometer humidity meters with dew point calculationinterchangeable %rh & temperature probe displays max/min humidity or temperature max/min function & dew point calculation long battery life - 10000 hours high accuracy ±2 %rh optional 3-point (25, 50 & 75 %rh) UKAS Certificate

    £115.00 ex VAT
      No tax

    unavailable for next day delivery as certificated at time of order
    unavailable for next day delivery as certificated at time of order
  • 6500 Therma hygrometer and thermometer measures humidity & air temperaturedew point calculation & max/min function fixed remote %rh & temperature probe 2 year guarantee optional 3-point (25, 50 & 75 %rh) UKAS Certificate 

    £70.00 ex VAT
      No tax

    in stock
    in stock
  • Hygro-Thermo pen-shaped pocket hygrometer and thermometer.displays humidity & temperature max/min memory function  truly pocket sized

    £17.50 ex VAT
      No tax

    in stock
    in stock
  • Nursery Thermometer - for monitoring a baby’s room temperatureindicates if a room temperature is cold, recommended or hot max/min temperature & humidity function easy to read, large LCD display

    £9.60 ex VAT
      No tax

    in stock
    in stock

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