The Gardner Liquid Color Standard Comparator provides the entire Gardner Color Scale.
The sealed tubes are filled with Cobalt Chloride Platinate solutions of varying concentrations, which correspond to known Gardner Scale yellowness value numbers 1 - 18. The solutions are standardized at 25 °C (77 °F), but visual evaluations made between 20 °C (68 °F) and 30 °C (86 °F) are substantially correct.
Two models are available: with or without illumination.
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