Water Activity Measurement - Moisture Meter

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The measurement of water activity or equilibrium relative humidity is a key parameter in the quality control of moisture-sensitive products or materials. Water activity is by definition the free or non chemically bound water in foods and other products. The bound water cannot be measured with this method.

ROTRONIC offers fast and accurate instruments for the measurement of water activity of foods, seeds, pharmaceuticals, cosmetics, etc. ROTRONIC unique technology guarantees water activity measurement at the lowest possible purchase price.

Choose from 3 different water activity systems to match your particular application. All systems use the high precision technology to ensure precise and accurate results in addition to full interchangeability between the quality control laboratory and production areas. The water activity probes measure product samples, bulk materials and can be used to test product packaging.

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

Solutions for measurement and monitoring of water activity

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:


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Best sellers:

  1. AwTherm

    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.

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  2. HygroLab C1 - high-end laboratory device

    HygroLab C1 - high-end laboratory device

    ROTRONIC provides a high-end laboratory device – the HygroLab C1 – for water activity measurements with up to four probes. Connect station probes and insertion probes for measuring water activity in cheese, meat, tobacco, building materials, animal feed, pharmaceuticals products and much more. Learn More
  3. 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
  4. HC2-AW-USB - USB Probe

    HC2-AW-USB - USB Probe

    The new 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
  5. HygroPalm - HP23-AW-A (with HC2-AW)

    HygroPalm - HP23-AW-A - portable 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
  6. 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
  7. HC2-HP28

    HC2-HP28 / HC2-HP50

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

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