The new DPD Pro test strip kit offers a quick and easy method to obtain accurate and reliable test results for commercial pools in less than two minutes. DPD Pro comes with two bottles of multi-way test strips and a durable color chart. Test strip refills are also available. The free DPD Pro smartphone app logs, tracks, analyzes, and graphs test results, making it easier to identify pools or spas requiring extra attention. Hach’s DPD Pro is certified by NSF to NSF/ANSI Standard 50 for free chlorine and pH and meets MAHC requirements. | 888-763-2435