ColorFlex EZ Tomato

The easy-to-use ColorFlex EZ Tomato is specifically designed to accurately measure the color of tomato in its every processed form – paste/purée, sauce, ketchup, juice, as well as fresh tomatoes. This accuracy is achieved by using 45º/0º optical geometry, the only measurement technology proven to measure color the way the human eye sees it.

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Easy-to-use. Compact. And Increased Performance. ColorFlex EZ Tomato Spectrophotometer gives you unsurpassed confidence and trust in your outcomes.

ColorFlex EZ Tomato is specifically designed to measure tomato color in its every processed form – paste/purée, sauce, ketchup, juice, as well as fresh tomatoes. Tomato color scales provided in firmware include: Tomato Paste Score (TPS), Tomato Sauce Score (TSS), Tomato Catsup Score (TCS), Tomato Juice Score (TJS), a/b ratio, Fresh Tomato Color Index (FTCI) & Lycopene index.

Hunter L,a,b color and CIE L*a*b* color, are also provided within the firmware, allowing for the capability to also use your ColorFlex EZ Tomato to measure the reflected color of a wide range of non-tomato samples – liquids, semisolids, powders, and solids. Inside its optional, custom designed, watertight carrying case will be everything you will need to immediately start measuring tomato color values, and includes: ColorFlex EZ Tomato instrument, Complete set of calibration & diagnostic tiles, HunterLab Tomato Tile, 2 glass sample cups, Port insert for sample cup, Sample cup opaque cover and backed up by the finest customer support in the industry and USDA approved.

Product Specifications

Measurement Principle: Port up or Port forward dual-beam benchtop spectrophotometer

Geometry: Directional annular 45° illumination / 0° viewing

Spectrophotometer: Sealed optics; 256-element diode array and a high resolution concave holographic grating

Port Diameter/View Diameter: 31.8 mm (1.25 in) illuminated/ 25.4 mm (1 in) measured

Specular Component: Excluded

Spectral Range: 400 nm – 700 nm

Spectral Resolution: < 3 nm

Effective Bandwidth: 10 nm equivalent triangular

Reporting Interval: 10 nm

Photometric Range: 0 to 150 %

Light Source: Pulsed Xenon Lamp

Flashes per Measurement: 1 flash

Lamp Life: > 1 million flashes

Measurement Time: < 1 second from button push to measurement 2 seconds from button push to data display

Minimum Interval Between Measurements: 3 seconds

Standards Conformance: CIE 15:2004, ISO 7724/1, ASTM E1164, DIN 5033, Teil 7 and JIS Z 8722 Condition C

Standards Traceability: Instrument standard assignment in accordance with National Institute of Standards and Technology (NIST) following practices described in CIE Publication 44 and ASTM E259

Inter-Instrument Agreement:

  • ∆E*< 0.15 CIE L*a*b* (Avg) on BCRA II Tile Set
  • ∆E*< 0.25 CIE L*a*b* (Max) on BCRA II Tile Set

Colorimetric Repeatability: ∆E*< 0.05 CIE L*a*b* on white tile (20 Readings)

Data Views: Color Data, Color Difference Data, Tristimulus Color Plot, Spectral Data, Spectral Difference Data, Spectral Plot, Spectral Difference Plot

USB Flash Drive Features: Backup of Setups and Data, Setup Transfer to Multiple Units, Data Export to Excel

Other Features: Pass/Fail, Average Multiple Readings, Search for Closest Standard

Illuminants: A, C, D50, D55, D65, D75, F2, F7, F11

Observers: 2° and 10°

Color Scales: CIE L*a*b*, Hunter Lab, CIE L*C*h, CIE Yxy, CIE XYZ

Color Difference Scales: ∆L*a*b*, ∆Lab, ∆L*C*H, ∆L*C*h, ∆Yxy, ∆XYZ

Color Difference Indices: ∆E*, ∆E, ∆C*, ∆C and ∆Ecmc

Indices and Metrics: E313 Whiteness and Tint (C/2° or D65/10°), E313 Yellowness (C/2° or D65/10°), D1925 Yellowness (C/2°), Y Brightness, Z%, 457 nm Brightness, Opacity, Color Strength (Average and Single Wavelength), Gray Change, Gray Stain, Metamerism Index, Shade Number

Tomato Color Model Only: Tomato Color Scores:

  • TPS – Tomato Paste Score
  • TSS – Tomato Sauce Score
  • TCS – Tomato Catsup Score
  • TJS – Tomato Juice Score
  • Tomato a/b Ratio
  • Lycopene Index

Languages: Chinese, English, French, German, Italian, Japanese, Spanish


  • Height: 16 cm (6.3 in.)
  • Width: 13 cm (5.1 in.)
  • Depth: 36 cm (14.2 in.)
  • Weight: 4.5 kg (9.9 lbs)

Display: 7.1 cm x 5.4 cm (2.8 in. x 2.1 in.) backlit color LCD

Interface: 3 USB 2.0 ports

Power: 100 to 240 VAC 47 to 63 Hz

Operating Environment: 10° to 40°C (50° to 104° F), 10 % to 90 % RH, noncondensing

Storage Environment: -20° to 65°C (-5° to 150° F), 10 % to 90 % RH, noncondensing

Standard Accessories:

  • Calibrated instrument white tile
  • Certificate of traceability
  • Black glass
  • Green diagnostic tile
  • Universal AC adaptor
  • Computer interface cable
  • USB flash drive
  • ColorFlex EZ User guide