bIOWAY pH Drop is suitable for testing tap water, Ground water and RO Water. Place a few drops of the pH liquid to test your tap or drinking water pH level. Check results instantly with the color chart which is given on Bottle (pH 1.0-14.0). 5ml. DO NOT DRINK WATER WITH THESE DROPS IN IT. How to Use: Pour 2-5ml of Water into the transparent glass add then put 3 to 5 drops of liquid in it to check and compare the pH level. Easily portable and simple to use: Alkaline Life pH test liquid Bottle with pH value color chart. EASY TO USE SQUEEZE BOTTLE and Water orp testing reagent liquid suitable for testing tap, Ground and RO Water. Place a few drops of the ph liquid to test your tap or drinking water ph level. Check results instantly with the color. If color is pink orp is negative is trasparent then orp is positive. Also useful for lab , aquerium, poultryfarm, swimmingpool, spas, ionizer, water purifier, r.o water testing.