What is a refractometer?
A refractometer is a device which determines the amount of dissolved solids (TDS) based on the refraction of light as it passes through a liquid. Simply put, how concentrated the coffee is. Once we know the TDS value, we are able to calculate the extraction yield, i.e. how much coffee we were able to use. The coffee bean contains about 30% soluble substances and the rest is cellulose. The ideal extraction is between 20 and 25%.
What will it tell us?
Coffee brewing - the refractometer is a useful helper when setting the recipe for espresso and filtered coffee.
Wrong setting of the grinder - commonly, the refractometer can help determine, if your grinding is fine enough. Low extraction yield can indicate that you grind your coffee too coarse for your particular method.
Grinding burrs - consistently low extraction below 20% may indicate that the burrs in the grinder are worn and need to be replaced.
Roasting - within one coffee we can determine how well the coffee is roasted. If it is extracted well or if it is a problem to achieve optimal values for a certain batch.
Wrong setting of the grinder - commonly, the refractometer can help determine, if your grinding is fine enough. Low extraction yield can indicate that you grind your coffee too coarse for your particular method.
Grinding burrs - consistently low extraction below 20% may indicate that the burrs in the grinder are worn and need to be replaced.
Roasting - within one coffee we can determine how well the coffee is roasted. If it is extracted well or if it is a problem to achieve optimal values for a certain batch.
Key Features
- 3 measurement modes - simple, automatic repeated measurement (up to 10), automatic sample detection and measurement start
- connection with CoffeeOS application
- miniature size
- competitive price
- fast and accurate
Specifications
- Manufacturer: DiFluid (China)
- Range: 0-30% TDS
- Resolution: 0.01%
- Accuracy: +- 0.3%
- Battery: 430 mAh
- Weight: 36g
- Size: 88 x 36 x 16 mm
- Package includes: refractometer, spoon, case, USB-C charging cable, microfiber cloth
How to measure
- Turn on the refractometer
- Drop distilled water onto the slide
- Calibrate the refractometer - press and then press and hold the button
- Wipe the slide
- Stir the prepared coffee and transfer the sample to the slide with a spoon
- Press the button and wait for the measured value
- Repeat the measurement until the refractometer repeatedly shows the same value
- Pour out the sample and clean the slide
Enter the measured value into the application. After entering the weight of the coffee used and the weight of the resulting drink, you will get the value of the extraction yield.
Zhlédněte video návod
