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Tonino

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.

Tonino color meter

Basic Operation

Sample Preparation
  1. put fine ground coffee into an espresso basket
  2. tamp hard
Scanning
  1. lift Tonino and put it on top of the coffee sample
  2. 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)

Raise to Wake

RaiseToWake

Scanning

Scanning

Target Mode

Target Mode
1scale name
2color reading
3target value
4difference
5roast name
6previous reading
adarker
bhit
clighter

Calibrating

Calibrating

Charging

Charging

Tonino Scale

ToninoAgtron*SCA
125 — 13080 — 90Very Light
115 — 12570 — 80Light
100 — 11560 — 70Medium Light
85 — 10050 — 60Medium
75 — 8540 — 50Medium Dark
60 — 7530 — 40Dark
50 — 6020 — 30Extremly Dark
10563Cupping

* Note that the Agtron values listed above are the result of a cubic approximation (R2 = 0.999) of 18 samples at (PSD 300-500 µm and 800-1200 µm), each with 2 x 4 replicates resulting in a total of 1440 readings taken with 4 Toninos and a reference device reporting readings on the Agtron Gourmet scale. Take them with a grain of salt!

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. 7-14g fine ground coffee (300-500µm)
Display
OLED color display, 0.96"
Default range
Tonino 50-130 (Agtron* 20-90)
Preheat Time
0sec
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: Return

CE-Conformity

This device fulfills the requirements of the EU Declaration of Conformity 2014/30/EU "Electromagnetic compatibility".



Open-Source