METER Aqualab 4TE, Benchtop Water Activity Meter

Speed and accuracy

Measure water activity 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, not some secondary parameter merely correlated with water activity. 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 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.

Sensor type

Chilled-mirror dewpoint; infrared temperature

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


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

Measurement time

Less than 5min

Sample cup capacity

7mL recommended (15mL full)


64 × 128 graphical

Data communications

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

Case dimensions

Length: 26.7cm
Width: 17.8cm
Height: 12.7cm

Case material

POLYLAC PA-765 (ABS) with fire retardant



Operating temperature

4°C to 50°C

Operating environment

0 to 90% relative humidity (noncondensing)

Universal power

110V to 220 VAC
50/60 Hz


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

METER Aqualab 4TE Brochure


METER Aqualab 4TE Full Manual


METER Aqualab 4TE Quickstart


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