6-IN-1 UPGRADE: Our Pool Test Strips upgrade pack 6-way test strips for PH, Total Chlorine, Free Chlorine, Total Alkalinity, Cyanuric Acid, and Total Hardness. QUICK AND ACCURATE:Simply dip a strip in water for 2 seconds, then remove.Hold strip horizontally for 30 seconds.Compare with color chart and read within 30 seconds. RESULTS OF HIGH ACCURACY: The 50 point PH test strips are made of high quality imported filter paper. Each spa test strip with 6 color indicators, high accuracy and reliable instant reading. CONVENIENT TO CARRY: Portable bottle, it is very convenient to take it anywhere. 1 bottle contains 50 Pool Test Strips. WIDELY APPLICATIONS: These strips are widely used for aquarium, hot tubs, baths, hot tubs and other water chemistry testing. Research shows that you should test your pool and spa at least twice a week, so you can monitor the quality of your water at regular intervals Number of shipments: 1 pcs