R2 Extract

A modern upgrade to an old technology,
specifically redesigned for coffee.
Buy Now
CHF 189.37 or CHF 47.34/two weeks for 2 mo.
R2 Extract measures the concentration of brewed coffee in TDS%.
TDS, or Total Dissolved Solids, indicates the percentage of a coffee beverage’s weight that comes from dissolved coffee material.
By measuring coffee concentration with R2 Extract, CoffeeOS can help you determine your extraction yield to dial in your brew in a way that brings out the exact flavor profile you desire.

Old

CCDs have a tiny light-sensitive area, making the design delicate, since even slight misalignment can render it unusable.

New

CMOS sensors handle misalignment well. Their larger, distributed light-sensitive area reduces accuracy loss from minor shifts or handling while improving data collection.

Maintaining accuracy with microcalibrations

Each test uses a reference material to perform precise microcalibrations, adjusting for tiny variations and ensuring every reading is accurate.

The aluminum sample dish quickly spreads heat evenly across the sample, maintaining stable temperatures for more reliable measurements.

Not accurate or precise
R2 Extract
Precise, not accurate

IP67 water resistance makes cleaning easy

Just rinse with tap water, and wipe dry.

We care.

At DiFluid, we take manufacturing attention to detail very seriously – checking every piece as it comes off the line to ensure maximum quality.

Introducing CoffeeOS

Plot your brew on one of the brew control charts to help understand your preferences and bring out the flavor profiles you desire.

What's in the Box?

Technical Specifications

Range 0-30% TDS
Refractive Index Range 1.33299-1.38660
Precision ±0.02% TDS
Refractive Index Precision ±0.00004
Accuracy ±0.03% TDS
Refractive Index Resolution 0.00002
Resolution 0.01% TDS
Test Time 4s
Operating Temperature 5℃-40℃
Battery Capacity 430mAh
Charging Port USB-C
Charging Specs 5V⎓0.3A
Water Resistance IP67

R2 Extract measures the concentration of brewed coffee in TDS%.

TDS, or Total Dissolved Solids, refers to what percent of the water is coffee by weight.