Are the LabScan XE Tomato and ColorFlex EZ Tomato Meters approved by USDA? Follow

In 2003 HunterLab went through a USDA/UCDavis qualification for two new sensors – the LabScan XE Tomato Meter and the ColorFlex Tomato Meter as well as a requalification for the D25A-9000. The coefficients used in the original equations were modified slightly to accommodate differences in the optics of these sensors.  These sensors now read the same as the original 1980 D25A-9 on processed tomato products – paste/purée, sauce, catsup and juice.

Approved July 10, 2003 USDA Tomato Scores for the HunterLab LabScan XE Tomato Meter: 

• HunterLab LabScan XE TPS = - 40.926 + 1.061(a) + 9.473(b) - 0.376(b^2)
• HunterLab LabScan XE TSS = - 149.176 + 1.139(a) + 21.608(b) - 0.826(b^2)
• HunterLab LabScan XE TCS = - 81.964 + 8.321(a) - 0.142(a^2) - 1.129(b)
• HunterLab LabScan XE TJS = 25.114 + 0.939(a) - 1.638(b)
• Fresh Tomato Color Index FTCI = (100((21.6/L) - (7.5*b/(L*a)))
• a/b ratio = a/b, where a and b are from the Hunter L, a, b color scale for C/2 conditions. 

Approved July 10, 2003 USDA Tomato Scores for the HunterLab ColorFlex Tomato Meter:

• Tomato Paste/Puree TPS = - 81.582 + (1.069*a) + (15.390*b) - (0.591*b^2)
• Tomato Sauce TSS = - 153.100 + (1.187*a) + (22.332*b) - (0.864*b^2)
• Tomato Catsup TCS = - 80.888 + (8.355*a) - (0.144*a^2) - (1.194*b)
• Tomato Juice TJS = 25.963 + (0.989*a) - (1.787*b)
• Fresh Tomato Color Index FTCI = (100((21.6/L) - (7.5*b/(L*a)))
• a/b ratio = a/b, where a and b are from the Hunter L, a, b color scale for C/2 conditions.

For more information see the document:

03-07-10 USDA Tomato Scores Approval for LabScan XE, ColorFlex, D25A-9000.pdf (2 MB)

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