Bench-top Water Activity Meter (4TE)

Benchtop Water Activity. Direct measure of water activity accurate to 0.003.  

Benchtop Water Activity. Direct measure of water activity accurate to 0.003.



Product Details

Speed and accuracy

Measure water activity (aw) in 5 minutes or less (average read time: 2.5 minutes) with ±0.003 aw accuracy. AQUALAB instruments are the fastest, most precise water activity meters available.

Use anywhere

Use the AQUALAB 4TE water activity meter to get lab-quality measurements at the line, receiving dock, processing plant, storage facility—anywhere you need to test and verify the safety and quality of your products and ingredients.

Internal temperature control lets you set a measuring temperature between 15 and 50 °C and use the instrument anywhere—even outside the QC lab.

How it works

The secret to the 4TE’s speed and accuracy is in its unique chilled mirror dew point sensor. The dew point sensor is a primary measure of water activity. Unlike other water activity sensors, the dew point sensor actually measures water activity (Aw), not some secondary parameter merely correlated with water activity (Aw). This makes the 4TE extremely accurate, so you can have complete confidence in your sample readings.

Easy to clean

The sample chamber lid flips up so contamination in the sample chamber is quick to spot and easy to clean.

Secure food safety data

The AQUALAB water activity meter 4TE stores time, date, and user information with every measurement and calibration, and can store up to 10,000 secure data points.

Administrative functions can be set to control access to data. Designate up to 25 unique users and passwords. Use the RS-232 serial data port to download or print data for statistical analysis and to maintain compliance records and archives.


  • Fast: water activity meter gets readings in 5 minutes or less
  • Accurate: ±0.003 aw
  • Verifiable with independent salt standards
  • Repeatable: different users, different locations, same result
  • Portable: weighs just 7 pounds
  • Easy to use: water activity meter yields precise measurements with minimal training
  • Secure: offers administrative control over calibration and sample data
  • Proven: used by 80 of the top 100 food companies



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
Temperature 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)
Weight 3.1 kg (6.8 lb)
Display 64 × 128 graphical
Operating temperature Minimum: 4 °C
Maximum: 50 °C
Operating environment 0%–90% noncondensing
Data communications USB A and RS-232 serial
9,600–115,000 baud
Power 110–220 VAC
50/60 Hz
COMPLIANCE Complies with ISO 18787:2017
Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)