Practical pH A2O Water pH OTO Dual Test Kit With Test Card For 100-125 TestingFeature:OTO pH Test Kit is a liquid tester that covers pH range from 4.0 to 10 and OTO range 0-2,Bidirectional OTO, total Cl and pH Test any water, instant results,Chlorine, bromine, alkalinity and pH testingEasy and popular testing method for swimming pools, spa or drinking water quality, Measures pH levels of water and saliva more accurately than pH test strips. Easy to use squeeze bottle Instructions IncludedHow to use: Simply squeeze a few drops of pH PERFECT reagent liquid into a small water sample, and wait for the water to change color. Compare the color of the water to the included pH scale chart to confirm pH levels. Material: liquid,Size:10ml per bottle,Color: transparent and red liquid,Quantity: 1 setNote:Size for manual measurement, there may be 0 to 2cm error, belongs to the normal phenomenon. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Included:1PC X pH Test.Test 1pc X Cl.1pc X Test Card.