Don't worry about the subjectivity of color charts, trust our handheld colorimeter for accurate measurements for your water testing. Get better accuracy than a standard test kit with our high range copper colorimeter . Our handheld colorimeter eliminates the effort of matching to a color chart by delivering a direct copper result digitally. - Simple, one-button operation makes getting your copper results a snap. - Quickly get your results without using a color chart. - Compatible with fresh or saltwater!