Icibgoods Litmus Paper PH Indicator Test Strips Alkaline Acid for Bathroom Swimming Pool Tank Test Paper 160 Pcs Take accurate alkaline/acid tests with this pack of 160 Litmus paper strips which come in 5 individually sealed books. Each book also includes a colour chart. Pack size: 2 books each containing 80 strips (160 strips in total) Colour charts included Each book is brand new and individually sealed in plastic for a longer life span and will arrive fresh and ready to use Make sure your water is safe before using