CoffMeter W1 – Precise Water Activity Measurement for Coffee

The CoffMeter W1 measures the water activity (aw) of coffee quickly and reliably—delivering dependable results in approximately 2 minutes, wherever you need them. Moisture percentage alone is not sufficient to accurately assess coffee safety and flavor preservation: Above 0.70 aw, the risk of mycotoxins increases significantly, while an aw value that is too low (~0.30) breaks down the delicate acids and sugars that give coffee its vibrancy and complexity. Thanks to its high-precision humidity sensor, the device provides consistent, laboratory-grade results, delivering the complete picture needed for a reliable assessment of stability, shelf life, and freshness.

The integrated temperature, humidity, and pressure measurement automatically compensates readings for different climates and altitudes. Calibration is performed with a single button using a saturated salt solution, ensuring stable and reproducible results in any environment. The magnetic sample tray makes inserting and removing samples especially easy and convenient. Via Bluetooth, results can be logged directly in the CoffeeOS app, quality trends can be tracked, and QC workflows can be centralized.

CoffMeter W1 – Precise Water Activity Measurement for Coffee

The CoffMeter W1 measures the water activity (aw) of coffee quickly and reliably—providing dependable results in approximately 2 minutes and ready for use anywhere. Moisture content alone is not enough to accurately assess coffee safety and flavor preservation: Above 0.70 aw, the risk of mycotoxins is high, while an aw value that is too low (~0.30) degrades the delicate acids and sugars that give coffee its vibrancy and complexity. Thanks to its high-precision humidity sensor, the device delivers consistent, laboratory-grade results, providing the complete picture needed for a reliable assessment of stability, shelf life, and freshness.

The integrated temperature, humidity, and pressure measurement automatically compensates readings for different climates and altitudes. Calibration is performed at the touch of a single button using a saturated salt solution, ensuring stable and reproducible results in any environment. The magnetic sample tray makes sample insertion and removal especially easy and convenient. Via Bluetooth, results can be logged directly in the CoffeeOS app, quality trends can be tracked, and QC workflows can be centralized.

Key Features

 

  • Water activity (aw) measurement in approximately 2 minutes
  • Reliable assessment of mycotoxin risk (above 0.70 aw) and aroma loss (~0.30 aw)
  • High-precision humidity sensor for consistent, laboratory-grade results
  • Automatic environmental compensation (temperature, humidity, pressure) for any altitude

 

 

  • One-button calibration using a saturated salt solution
  • Magnetic sample tray for easy handling
  • Bluetooth & CoffeeOS integration for data logging and QC workflows
  • Ideal for green coffee traders, importers, roasters, cafés, and coffee enthusiasts

Key Features

  • Water activity (aw) measurement in approximately 2 minutes
  • Reliable assessment of mycotoxin risk (above 0.70 aw) and aroma loss (~0.30 aw)
  • High-precision humidity sensor for consistent, laboratory-grade results
  • Automatic environmental compensation (temperature, humidity, pressure) for any altitude
  • One-button calibration using a saturated salt solution
  • Magnetic sample tray for easy handling
  • Bluetooth- & CoffeeOS integration for logging and QC workflows
  • Ideal for green coffee traders, importers, roasters, cafés, and coffee enthusiasts

Everything you need to know

Product description & features

Technical Specifications

 

  • Measurement principle: moisture-based detection
  • Measurement range: 0.05 – 0.99 aw
  • Accuracy: ±0.02 aw
  • Resolution: 0.001 aw
  • Measurement time: approx. 2 minutes
  • Sample size: 6–8 g coffee beans

 

 

  • Connectivity: Bluetooth (CoffeeOS app)
  • Calibration: one-button, saturated salt solution
  • Charging port: USB-C
  • Weight: 750 g

Technical Specifications

  • Measurement principle: moisture-based detection
  • Measurement range: 0.05 – 0.99 aw
  • Accuracy: ±0.02 aw
  • Resolution: 0.001 aw
  • Measurement time: approx. 2 minutes
  • Sample size: 6–8 g coffee beans
  • Connectivity: Bluetooth (CoffeeOS app)
  • Calibration: One-button, saturated salt solution
  • Charging port: USB-C
  • Weight: 750 g

Package Contents

  • CoffMeter W1 measuring device
  • Sample tray & sample holder
  • Scoop, brush
  • USB-C cable
  • Calibration vial
  • Protective case

Package Contents

  • CoffMeter W1 measuring device
  • Sample tray & sample holder
  • Scoop, brush
  • USB-C cable
  • Calibration vial
  • Protective case

Download User Manual

Here you can download the user manual as a PDF:

Download
User Manual

Here you can download the user manual as a PDF:

Roast Rebels Promise

Your Satisfaction, Our Mission!

competent
Guaranteed

Latest Version

consultation
Consultation & Support

Competent & Personal

delivery
Free Delivery

Within the EU

fast
Fast Delivery

From stock in Germany

center
Repairs & Spare Parts

Service Center for Repairs & Spare Parts

guarantee
2 Years Guarantee

For Individuals & Companies

Related Videos

Precise coffee analysis with DiFluid measuring devices

Skip product gallery

You might also be interested in these products

NEW
DiFluid CoffMeter M1 DiFluid CoffMeter M1
DiFluid CoffMeter M1

Average rating of 5 out of 5 stars

Green coffee analyzer for fast and precise determination of moisture content and density of coffee beans.

Regular price: €359.00
Product Quantity: Enter the desired amount or use the buttons to increase or decrease the quantity.
NEW
DiFluid CoffMeter A1 DiFluid CoffMeter A1
DiFluid CoffMeter A1

Coffee roast degree meter – precise determination of the roast level for beans and ground coffee.

Regular price: €389.00
Product Quantity: Enter the desired amount or use the buttons to increase or decrease the quantity.

The CoffMeter W1 provides quick and reliable water activity analysis with accuracy to within ±0.02 aw, in a compact portable design. Readings are delivered in around two minutes, with one-touch calibration and Bluetooth connectivity to the CoffeeOS app. Essential for roasters, traders and enthusiasts who want data-driven control over coffee freshness, shelf life and safety.

App connection: Possible
Measurement: Water Activity

0 of 0 reviews

Average rating of 0 out of 5 stars

Leave a review!

Share your experiences with other customers.


The payment is uncomplicated in our store! You can find detailed info about payment and shipping here. We offer the following payment methods:

PayPal Mastercard Visa Apple Pay iDEAL eps Google Pay Bancontact Prepayment / bank transfer Klarna PayPal Credit / Debit Card

We ship orders from a warehouse in Germany via DHL Paket (for shipments within Germany) or DHL International Premium (for shipments to all other countries).

DHL – product image

WhatsApp