DPD Pro Is A Breakthrough Prododuct Developed Specifically For The Commercial Pool and Spa Market. Among Public Pool Operators Surveyed, It’S Clear That A Faster and Easier DPD Testing Method Is Desired. DPD Pro Offers The Convenience Of Seven Key Parameters In 2 Multi-Way Test Strips Conveniently Packaged In A Sturdy Test Kit. The Color Chart Included In The Kit Is Durable – Both Uv and Water Resistant – So It Will Withstand Normal Use Over An Extended Period Of Time.