Color is a suitable indicator of the degree of roast for a given raw material
S. Schenker, PhD, ETH Zürich, 2000
Roast degree accounts for more than 80% of the total variation in the sensory properties of coffee
M. Münchow et al., FLAVOR DEVELOPMENT, 2020
Why?
Traditionally the color of coffee has been used to determine the degree of roasts and to enhance consistency in the end product. Nowadays, roast temperatures are recorded to allow the reproduction of previous roasts. However, roast profiles vary widely across different conditions and roaster designs. Thus, to compare roast levels in an unbiased way, Tonino maps the color of ground coffee to a numeric scale independent of the production process.
Basic Operation
Sample Preparation
- put fine ground coffee into an espresso basket
- tamp hard
Scanning
- lift Tonino and put it on top of the coffee sample
- read the roast degree from the display
By tamping instead of just leveling the coffee the results are less influenced by the grind.
Features
- small sample size
- gesture-driven
- wireless operation and charging
- target mode
- user-defined scales
- environmentally friendly
- open-source Tonino app
(Mac/Windows/Linux)
1 | scale name |
2 | color reading |
3 | target value |
4 | difference |
5 | roast name |
6 | previous reading |
Tonino Scale
- 115–130
- Cinnamon
- 100–115
- Light
- 90–100
- City
- 80–90
- Medium
- 70–80
- Full City
- 60–70
- Dark
- 50–60
- Heavy
Technical Data
- Sensor
- True Color 64-channel photo detector
- Measurement principle
- Polychromatic reflection
- Illumination source
- 4 full-spectrum white LEDs
- Observed surface area
- 5.3cm2
- Sample size
- ca. 20g fine ground coffee
- Display
- OLED color display, 0.96"
- Default range
- 50-130
- Time per measurement
- 2sec
- Measuring precision
- ±2 scale divisions
- Data interface
- RS232 serial via USB
- Power supply
- Micro USB
- Battery capacity
- 270mA (12h of operation; charged in 4h)
- Power consumption
- 0.25-18mA (0.000925-0.066W)
- Dimensions
- 4.7cm x 3.8cm x 4.3cm
- Weight
- 50g
- Included accessories
- Calibration and charging base
- Short micro USB cable
Waste disposal/Environmental protection According to the EU directive 2012/19/EU "Waste Electrical and Electronic Equipment (WEEE)", this device must not be disposed as unsorted municipal waste. Instead it must be collected separately.
CE-Conformity This device fulfills the requirements of the EU Declaration of Conformity 2014/30/EU "Electromagnetic compatibility".
Protect against direct sun, dust and humidity
Do not operate outside the specified temperature range
Keep dry
Do not touch the sensor element