Block Comparator - Wood/Glass/Rubber/Metal

This artifact is a LaMotte Block Comparator, used in the citrus industry.  It contains one set of Permanent Color Standards, such as Bromthymol Blue (pH 6.0 - 7.6).  This portable kit could be used in the field.  CONDITION:  The wood top to this artifact is missing.
Abstract/Description: This artifact is a LaMotte Block Comparator, used in the citrus industry. It contains one set of Permanent Color Standards, such as Bromthymol Blue (pH 6.0 - 7.6). This portable kit could be used in the field. CONDITION: The wood top to this artifact is missing.
Subject(s): AGRIGULTURE - Citrus and Avocados
Corona, CA