In-line process refractometers

for industrial process instrumentation and control applications. 

We offer a range of products based on refractometer technology meeting the liquid measuring needs of different industries. 

Watch the video

Tutorial video to LM web pages

Video guide

to the new dedicated Liquid Measurements pages on!

Explore all useful resources on Liquid Measurements topics:

  • application notes and whitepapers
  • product news and videos
  • helpful articles and eBooks
  • and much more

Or check out the same information from the brochure.

What is process refractometer

Vaisala K-PATENTS® Process Refractometers are used for in-line liquid concentration measurements enabling advanced and accurate process control supporting industrial automation.

Learn more about the principle, technology, and measurement behind a refractometer; refractive index.


Vaisala and our authorized Liquid measurements distributors offer comprehensive customer care covering the entire lifecycle of Vaisala K‑PATENTS refractometers, and provide application support. See our refractometer service offering from this page.