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SpaBalancer Test Stripes - To measure Ultrashock, alkalinity and pH. You can measure the chlorine with the Ultrashock level. The box contains 50 test strips. To provide accurate measurements and keep their high quality over a long period, the strips are packed into 5 aluminium packs. For pH measuring, we recommend to use our electronic pH tester. Electronic pH tester measurements are more accurate because it can be calibrated.