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Comparison : Item # HK600MKII, HYDROKIT® MKII 600 test (30 ppm)
Item # HK600MKII-15, HYDROKIT® MKII 600 test (15 ppm)
Item # HK100MKII, HYDROKIT® MKII 100 test (30 ppm)
Item # HK100MKII-15, HYDROKIT® MKII 100 test (15 ppm)