The AQUALAB 4TE DUO uses product-specific calibration models to read water activity and moisture content simultaneously, giving you two readings from a single sample.

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 Series 4

Add product-specific calibration models to any SKALA-connected Series 4. SKALA uses the appropriate model when the technician identifies a sample.


  • 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%
Temperature Range: 15-50 °C
Resolution: 0.01 °C
Accuracy: ±0.2 °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)
Weight 3.1 kg (6.8 lb)
Display 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
Power 110–220 VAC
50/60 Hz
COMPLIANCE Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)