Water Activity Measurement - Moisture Meter - Measurement and Monitoring of aw Value

icon video not visible? Try this link: - ROTRONIC Water Activity

The measurement of water activity or equilibrium relative humidity (ERH) is a key parameter in the quality control of moisture sensitive products or materials. 

If there is too much water in a product, there is a risk of microbial growth and water migration. This can lead to clumping, changes in consistency and reduced shelf-life. Manufacturers of foods and pharmaceutical products must, for example, show to the FDA that the water activity of a product has declined to such an extent that bacteria can no longer grow.

You can find further information on the measurement of water activity and equilibrium relative humidity in our video, brochure or white paper:

Browse our brochure and find products and solutions for measuring and monitoring water activity as well as information on software and calibration.

White Paper "Water Activity;

The Whitepaper contains detailed theory about water, water activity and water content. It also provides information on where and why it is important to measure water activity and how to perform water activity measurements.

Fill in the form and download the 12-page white paper for free:


Best sellers:

  1. AwTherm - EN

    AwTherm - Water Activity Meter

    With AwTherm, ROTRONIC offers a professional, high-end laboratory unit for temperature-stabilized measurement of water activity in the foodstuffs, cosmetics, or pharmaceutical industries.

    Learn More
  2. HYGROLAB - Laboratory device for water activity measurements

    HYGROLAB - Laboratory device for water activity measurements

    The Rotronic HygroLab is an innovative high-end laboratory analyzer for water activity measurements with up to four measurement probe inputs. Simultaneous or asynchronous measurement with the tried-and-tested AW Quick measuring function for pharmaceutical products, tobacco, coffee, food and many more. Learn More
  3. HygroLab C1

    HygroLab C1

    The Hygrolab C1 is no longer available. HERE you will find the innovative successor device with a large touch screen and 4 USB ports.

    Learn More
  4. HC2-AW

    HC2-AW - AW probe

    For water activity measurements in bulk materials such as flour, grain, spices, etc. For solid and pasty products such as meat, sausage as well as oils, fats, etc. Learn More
  5. HC2-AW-USB - USB Probe

    HC2-AW-USB - USB Probe

    The station probe HC2-AW-USB offers new possibilities. The USB probe can be directly connected to a PC running HW4-P-QUICK-Vx software enabling water activity measurement capability. The HC2-AW-USB is the perfect device for a multi station application, as multiple probes can be attached to a single PC. Learn More
  6. HygroPalm - HP23-AW-A (with HC2-AW)

    HygroPalm - HP23-AW-A - Portable Water Activity Analyzer

    In many situations it can be very useful to measure water activity in production or storage rooms, e.g. inspection of bulk materials to ensure they meet specifications. Learn More
  7. HP23-AW-A-SET


    The HygroPalm AW sets are the perfect solution for on-site measurements. They are supplied in a tough, lightweight ABS carry case and include everything needed for measurement and calibration. Learn More
  8. HC2-HP28


    The insertion probe is suitable for measurement in bulk materials, bricks, concrete, etc. It measures humidity and temperature and calculates the dew/frost point.

    Learn More