FREE Moisture Measurement Slide Rule

Michell Instruments has produced an absolute humidity and relative humidity slide rule.
It was made with the customer in mind and provides the user with a fast, clear and simple  slide rule formula. The useful tool also includes practical definitions and equations such as the equation for ppmv and the way of calculating a given saturation vapour pressure.

The front, ”Michell” side of the slide rule calculates absolute humidity allowing the user to align measured dewpoint value with the operating pressure and then read the moisture content (ppmv) clearly and concisely. The user can then reverse the process to calculate dewpoint at pressure from ppmv. The reverse, or “Rense” side of the calculator allows the user to set temperature (oC or oF) at a given relative humidity and then calculate the dewpoint. This process can then be reversed to calculate % rh at temperature from dewpoint.

If you would like to receive a FREE Moisture Measurement Slide Rule Calculator, or require any further information about Michell or Rense products, please contact:

Michell Instruments
Nuffield Close

Tel - +44(0)1223 434 800
Fax - +44(0)1223 434 895
e-mail –

About Michell Instruments

Michell Instruments is the international leader in the field of moisture and humidity measurement solutions. With over 30 years experience, Michell designs and manufactures a wide range of transmitters, instruments and system solutions capable of measuring trace moisture, humidity and dew point in a vast range of applications and industries ranging from compressed air, power generation, process, oil and gas, pharmaceutical and many more. With a fast growing international subsidiary and distribution network Michell provides solutions in moisture and humidity to the most demanding customers across the globe. 

About Rense Instruments

Rense Instruments is an industry leader in the development and production of humidity and temperature measuring sensors, humidity portable and laboratory instruments and calibration transfer standards. Rense Instruments was acquired by Michell in January 2006 and completes Michell Instruments product range in humidity solutions. Rense instruments expertise spans over three decades focusing on serving customers with solutions for HVAC, energy management, storage and many other general industry and OEM applications.


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