Accurate and reliable water activity meter

Fast. Precise. First. AQUALAB water activity meters are precision at its finest, leading the market in speed and accuracy.

Speed and accuracy.

The AQUALAB 4TE water activity meter can measure water activity (aw) in 5 minutes or less with ±0.003 accuracy. AQUALAB instruments are the fastest, most precise water activity meters available.


for readings

Measure anywhere

Get lab-quality water activity (aw) measurements no matter what step of your process, thanks to the 4TE's rugged hardware and internal temperature control. At the line, receiving dock, processing plant, storage facility, or even outside the quality control lab - anywhere you need to test and verify the safety and quality of your products. 


aw accuracy 

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 measures water activity (aw) directly, not secondary parameters correlated with water activity. This makes the 4TE extremely accurate, so you can have complete confidence in your sample readings.

Easy maintenance

AQUALAB 4TE lets you spot contamination quickly with the flip of the lid. The sample chamber can be opened for any easy-to-clean maintenance.

Starter set 

All verified AQUALAB 4TE’s are shipped with a calibration certificate, power cord, USB A to USB B cable, 50 disposable sample cups, an AQUALAB cleaning kit, and two vials of each of the verification solutions.

Built for abuse

Take readings in the harshest conditions – on the line, in receiving or shipping areas. Aqualab devices don’t need a pristine lab to consistently deliver quality data.

Long life, good investment

We stand behind our devices for decades. You’ll never be left without support. No pushy upgrade schemes or shady long-term maintenance contracts, just long-term benefits.

In the lead for 40 years

Since our founding in 1983, we’ve stayed laser-focused on moisture management science – and built the industry’s largest body of expertise on the topic.

Any sample, always accurate

92% of the top 100 food companies use Aqualab devices for moisture analysis. Throughout formulation, production and QA — from raw ingredients to final product and anything between.

Feature summary

  • Fast: water activity meter gets readings in five minutes or less
  • Accurate: ±0.003 aw
  • Verifiable: ships with independent salt standards
  • Repeatable: different users, different locations, same result
  • Portable: weighs just seven 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 more than 90 of the top 100 food companies 
  • Calibration certificate
  • Power cord
  • USB A to USB B cable
  • 50 disposable sample cups
  • AQUALAB Cleaning Kit
  • Two vials of verification solutions


Delivery time:  usually ships within 2 business days

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