Humidity Calibration

Humidity Calibration Services

Humidity CalibrationOur calibration service offers traceable or UKAS calibrations on all standard and data-logging humidity meters. We strive to keep our services as fast as possible and offer two standard humidity calibrations, both at two temperature points (20° & 30°C), and with an option of two or three humidity points (35% & 75%RH with an option for 55%RH). Should these points not be fully suited to your application, additional points can be purchased or get in touch for a customised calibration.

We also offer a UKAS Humidity Calibration service through our fully accredited partner laboratories at a standard 2 temperature and 2 humidity points. Additional points are available.

To contact our calibration team, call: 01530 566804

Humidity Meter Calibration Price List

Traceable Calibration Hygrometer
Standard Points (RECAL-HT): 20°C & 30°C (Temperature)
35% & 75%RH @ 20°C (Humidity)
Additional Points: Available from 0°C to 50°C
Available from 30% to 95%RH
Calibration Standard: Traceable to UKAS*
* Traceable certification is adequate for most applications and meets the calibration requirements of ISO 9001. All measurements contained in this type of certification are traceable back to National UKAS Standards.
UKAS Calibration Hygrometer
Standard Points (UKAS-HT): 20°C & 30°C (Temperature)
35% & 75%RH @ 20°C (Humidity)
Additional Points: Available from 5°C to 50°C
Available from 25% to 95%RH
Calibration Standard: UKAS Certified Calibration**
**A UKAS calibration can also be considered traceable. The difference between the two is that UKAS calibrations are carried out under the remit of an ISO/IEC 17025 quality system by a laboratory that has been accredited by UKAS, to ensure the consistency and accuracy of results. As such, all our UKAS calibrations are carried out by our fully accredited partner laboratories.

Humidity Meter Calibration Procedure

Step 1: Send us your instruments

Instrumentation can be sent to us with a copy of your official order, or order confirmation. Alternatively, we can arrange a collection via our own designated courier (charges apply). Please contact our Technical Team who will be happy to arrange this. Please ensure your instruments are clean and free from contaminants.

Step 2: Booking in

When your instrument arrives on-site it undergoes an initial inspection by our calibration staff. The instrument is checked for any damage, and functionality and batteries are tested for the correct voltage. If required, new batteries are installed and the item is booked in and placed safely inside our lab to acclimatise to the testing environment for 24 hours. If you have selected a UKAS calibration, your item is redirected to our partner UKAS calibration labs. Should any faults or damage be found our team will contact you to discuss your options.

Step 3: Testing


Your humidity meters are calibrated using a specialist Humidity Chamber where precise temperature and humidity conditions can be simulated. Its accuracy is recorded and compared against UKAS calibrated equipment at pre-determined calibration points. If your meter is reading out of specification, our technicians will adjust it where possible and re-test.


Carried out under the most stringent conditions, your humidity meter is placed in a humidity chamber where its accuracy is recorded at the designated calibration points. Due to UKAS requirements, the accuracy of your instruments will be recorded at each point, but no adjustments can be undertaken should it be out of specification.

Step 4: Producing your Humidity Meter Calibration Certificate

Your test data is detailed on calibration certificates which include testing conditions, equipment used, measurement errors, and any measurements of uncertainty ensuring full traceability.

Step 5: Payment and Shipping

Our calibration team will contact you with an update about your instruments and request payment. Your items are then safely repackaged and shipped via express delivery that typically arrives the very next day.

Why Choose ATP for your Calibration?

With over 30 years of experience, we have tailored our calibration services to offer the very best in convenience.

Customisable Calibration

All our calibrations come with standard issued points. Should these not fulfill the needs of your application we offer purchasable additional points or even the option for you to fully customise your calibration to points of your choosing.

Fast Calibration

We know that being without your instrumentation can cause disruption to your business. As such our traceable humidity calibration services come with a typical 2-4 day turnaround on receipt of the item, subject to no faults being found. UKAS Calibrations will typically take longer.

Battery Checks / Replacement

All instrument batteries should be checked and replaced if low voltage prior to calibration. We do this for you and replace all batteries if required for a minimal charge.

Instrument Adjustment / Repair

If your instrument is found to be out of spec or faulty we will do our best to adjust and repair your instrument as part of the calibration.

Replacement Instrumentation

Should an unfixable fault be found in your instrument, our online store is ready with replacement instruments in stock and ready to ship to cause minimal disruption to your business.