Poolmaster 22235 2-Way Duo Test Kit for Chlorine and pH

Poolmaster’s Essential Collection consists of the essential must-have products for customary pool and spa maintenance constructed with durable materials designed to keep your pool sparkling. For use in maintaining your pool/spa’s proper water chemistry, the 2-Way Kit tests for two chemical factors: Chlorine and pH. Comes with round vial test block and 1/2oz. solutions of Phenol Red and OTO with color chart included.