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 3-Way Kit tests for three chemical factors: Chlorine, Bromine and pH. Kit comes with protective weather-resistant case, testing block with color readouts and easy-to-read numerical indications and 1/2oz. solutions of Phenol Red and OTO.