National Physical Laboratory

Recording humidity measurement results

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Results can be recorded in the following ways:

  • hygrometers with internal data logging
  • read using a computer (by connection, or even wirelessly)
  • a person reading displayed values and writing down results

You should record:

  • humidity value and units
  • for relative humidity measurements temperature is essential
  • pressure must be known for psychrometers - and usually when measuring a pressurised gas
  • date, time, place, method, operator
  • anything else that allows the measurement to be understood later

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