DUO: Water Activity + Moisture Content


All AQUALAB instruments now come with DUO functionality so you can measure water activity and get moisture content simultaneously from a single sample.  To use the DUO function, you need a product-specific calibration model for each of the products you want to measure.

Best products

Most products with less than 40% moisture (by weight) will work using DUO calibration models. Products with moistures above 40% usually have such uniformly high water activity values that other moisture analyzers are a better fit.

High precision and repeatability

Below 40%, moisture changes affect water activity readings more strongly, yielding high precision and repeatability.

SKALA adds DUO models to any AQUALAB

Add product-specific calibration models to any SKALA-connected water activity instrument. SKALA uses the appropriate model when the technician identifies a sample.

Request a quote Contact us Connect your AQUALAB 4TE DUO


  • Costs less to run than other moisture analyzers
  • Odor-free
  • Chemical-free
  • No oven, no balance
  • Precise: reduces error by up to 90%
  • Verifiable with independent salt standards
  • Repeatable
  • Green: uses 95% less energy
  • Portable: the meter weighs just 7 pounds
  • Easy to use: precise measurements with minimal training
  • Secure: offers administrative control over calibration and sample data
  • Complete moisture analysis: reads both moisture content and water activity



Water activity

Range: 0.030–1.000 aw
Resolution: 0.0001 aw
Accuracy: ±0.003 (4TE dew point)
±0.015 (4TEV capacitance)
Repeatability: 0.001 aw

Moisture content

Accuracy: 0.1%–0.5% to moisture content reference
Repeatability: 0.02%


Range: 15-50 °C
Resolution: 0.01 °C
Accuracy: ±0.1 °C

Read time

~5 min


Case dimensions

Length: 26.7 cm (10.5 in)
Width: 17.8 cm (7.0 in)
Height: 12.7 cm (5.0 in)

Case material

POLYLAC PA-765 (ABS) with fire retardant

Sample cup capacity

14 mL (0.47 fl oz)


3.1 kg (6.8 lb)


64 × 128 graphical

Operating temperature

Minimum: 4 °C
Maximum: 50 °C

Operating environment

0%–90% noncondensing

Sample dish capacity

7.5 mL recommended (15 mL full)

Data communications

USB A and RS-232 serial
9,600–115,000 baud


110–220 VAC
50/60 Hz


Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)

California requires the following notice:

⚠️ WARNING: This product may contain chemicals including ethylene glycol, lead, nickel, styrene and cadmium, which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov


Have a question or problem? Our support team can help.

We manufacture, test, calibrate, and repair every instrument in house. Our scientists and technicians use the instruments every day in our product testing lab. No matter what your question is, we have someone who can help you answer it.

Email: support.food@metergroup.com

Phone: 509-332-5601