WaterLab – aW meter

The WaterLab aW meter is indispensable for determining the shelf life of a product and the risk of microbial growth over time, especially in the quality control of products and ingredients in the pharmaceutical, food and cosmetics industries, pet food production or the herbal sector.

The WaterLab convinces with its speed and precision in measuring water activity (aW) thanks to its dew point sensor, which measures the actual water activity, and not related or secondary parameters as is the case with other types of sensors. This enables the WaterLab to comply with ISO standards for water activity determination, making it one of the fastest and most accurate aW meters on the market. 

The easy operation and intuitive menu navigation via the integrated touch screen display as well as new calibration and control modes allow the user to perform fast measurements and also to optimise analysis times, even when measuring samples with very different aW values multiple times. Data can be exported in a variety of ways. Any contamination of the sample chamber is easy to detect and to clean without risk of damage due to the easy access by opening the lid and the smart design of the chamber.

Steroglass WaterLab | aw meter  | Water Activity Meter

Steroglass WaterLab | aw meter | easy to clean

Technical data



Measurement range: from 0.030 to 1.000 aW
Accuracy:  ± 0.003aW at + 25°C (± 1°C)
Repeatability (standard deviation): ± 0.001 aW
Calibration: selective and multi-point, with single-use calibration standards (0.150 - 0.250 - 0.500 - 0.760 - 0.920 - 0.984 - 1.000 aW)
Measuring times at equilibrium: <5 minutes on average
Probe sensor: dew point (sensor required by ISO 21807: 2004 and subsequent 18787)
Display resolution: ± 0.0001 aW (4 decimal places)
Data security: administrator and user management by password, according to 21 CFR part 11 - guarantee of unchangeability of the recorded data
Complete thermostatic of the sample: adjustable from + 15°C to + 50°C in 1°C steps, e.g. for stress tests
Operating temperature: from + 5°C to + 40°C
Digital resolution: 0.01°C
Temperature accuracy: ± 0.2°C
Design: dew point sensor block with front opening for easy insertion of the sample and simple cleaning, equipped with: fan for homogeneous conditions in the sample chamber, well-sealed chamber to avoid environmental influences, 7'' touch screen colour display for easy operation
Ease of use/software: intuitive with minimal training, pop-up and warning system for easy workflow management
Analysis modes: • SINGLE ANALYSIS: for standard tests
• LES: for measurement of complex matrix products, low emmission samples, with lower accuracy
• N3: 3 consecutive measurements with an adjustable accuracy; for repeatability tests under limit conditions (e.g. ±0.001 aW)
• ISO: 3 measurements with an accuracy of 0.0003 aW in accordance with ISO 21807/18787
• LIFE TEST: Temperature ramps for product stress: measurement of aW at selectable stress temperature compared to standard conditions; to check water activity at different temperatures (simulating real conditions)
Qualification IQ/OQ:  IQ/OQ documents available on request
Connections: • Ethernet connection, LIMS connectivity
• USB type B for connection to external PC
• USB type A for data download (.csv) to USB memory stick
• RS-232 for connection to barcode scanner or thermal printer
Size (L x W x H): 26 x 26 x 17 cm
Weight:  3.85 kg
Selectable languages:  German, English, French, Italian, Spanish








STG-SQLA081652 Waterlab cups 250 pcs  
STG-SQLA081653 Waterlab lids 250 pcs  
STG-SQLA081946 Waterlab cups with lids 250 pcs  
STG-SQPD083591 Waterlab cleaning kit  
STG-SQPD086501 Calibration Standard 0.150 aw 50 pcs  
STG-SQPD081790 Calibration Standard 0.250 aw 50 pcs  
STG-SQPD081791 Calibration Standard 0.500 aw 50 pcs  
STG-SQPD081792 Calibration Standard 0.760 aw 50 pcs  
STG-SQPD081793 Calibration Standard 0.920 aw 50 pcs  
STG-SQPD081796 Calibration Standard 0.984 aw 50 pcs  
STG-SQPD081795 Calibration Standard 1.000 aw 50 pcs  


Technical Service

During our business hours, our free telephone support will be glad to assist you in case of any questions. Our Technicians take care of the delivery and installation of original spare parts of the highest quality as well as certified testing, measuring, and control equipment. Our maintenance according to manufacturer specifications includes functional tests, cleaning, accuracy testing with calibration as well as a detailed report. In addition, our maintenance contracts protect your investments and reduce the total cost of ownership.

Detailed information about our support options can be found here.

Logo Steroglass

Steroglass is headquartered in Perugia, Italy, and operating on a global level in the chemical, biotechnological and pharmaceutical fields. The company has mainly focused on evaporation, titration, metal detection, enzymatic and colorimetric analyses, but in recent years they have added a big variety of worldwide imported products to complete their own range, thus meeting most of their researchers and lab analysts’ requirements. The founders have always strived to achieve remarkable goals by designing and manufacturing borosilicate glass lab equipment, industrial plants for chemical and pharmaceutical purposes as well as electronical instruments with high-tech mechanical components and related software.

More about Steroglass: www.steroglass.it


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125 employees
10 locations in europe
32 years of experience