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clay soils duplex indicator reagent 5 color chart spot plate 50 tests 2764 5023 ... unique easy fast specially designed color comparator and capsule system that ... make quick work of testing color comparator 10 ph capsules instructions ... all results are compared to standard color charts laminated 2760 2761 2762 2763 ...

turf lab field unit a unique method for colorimetric analysis of turf soils nutrients are ... and are read against translucent color standards in an octa-slide comparator ... nutrients at an economical price colorimetric tests use octet comparators with ... permanent color standards for accurate visual color ... 5406 5406.5 model am-41 hydroponics colorimeter outfit model am-41 reagent refill $503. ... model ast offers the finest visual color matching system available to today s ... reactions measured against laminated color charts 5029 5029.5 5007 5007.5 5061 ... sample solution in a test tube for a color reaction the resulting color is read in ... an octet comparator with permanent color standards for ph values the kit has ...