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50 x test strips for 6-in-1 pool in quick release bag pH value: 6.2 to 9 Highest quality standards Laboratory tested and with German instructions Easy to read - Excellent colour scale Total hardness: 0 to 1000 ppm Free chlorine: 0 to 10 ppm Total chlorine: 0 to 10 ppm Cyanic acid: 0 to 240 ppm Total alkalinity: 0 to 240 ppm