What water activity is and why it matters

Water activity (Aw) shows how 'free' the water inside the bean is, meaning how available it is for chemical reactions and microbial activity. Unlike simple moisture, Aw relates directly to green coffee stability, shelf life and how the coffee behaves in the roaster.

With the CoffMeter W1 you can check every lot you receive, monitor storage conditions and keep roast profiles consistent from harvest to harvest.

Key features

How to use

1. Fill the rotating sample tray with beans using the included spoon.
2. Place the tray on the magnetic base and close the chamber.
3. Watch the curve: the Aw value stabilises in about 2 minutes.
4. Save or sync the reading to CoffeeOS and remove the sample. Do not leave samples inside the device long-term.

Who it's for

• Roasteries checking green coffee on arrival and in storage.
• QC labs and importers evaluating sample stability and shelf life.
• Production teams who need batch-to-batch consistency.

Pair it with the CoffMeter M1 (moisture and density) and CoffMeter A1 (roast colour) for a complete analysis of your coffee.