Litmus pH 1 to 14 Test Paper Book 80 StripsThis pH test paper allows you to accurately test the pH of various substances including food, water/aquariums, soil, and more.Approximate size of pack 70 x 45mmpH 1-14 Colour chart in each pack.Instructions for Use:Remove a litmus strip from the pack. Drip liquid onto the strip, press against object / damp sample or dip the strip into liquid for half a second to begin the test. Wait 15 seconds for the reaction to occur. Please note these strips will not be able to indicate the acidity or alkalinity of a solution when its density is lower than 0.01%. Compare the colour change to the colour chart provided to indicate the level of acidityMatch with the pH scale colour chart as follows:1-3 Indicates a Highly Acidic Substance 4-6 Indicates an Acidic Substance 7 Indicates Neutral 8-11 Indicates an Alkaline Substance 12-14 Indicates a Highly Alkaline Substance FeaturesTEST LEVEL; pH range from 1 to 1480 STRIPS; Includes 80 litmus paper strips per bookCAN BE USED FOR; Use to test soil acidity, water/soap neutralityCOLOUR CODED; Easy to follow chartDIMENSIONS; Approximate size of pack 70 x 45mmContains10x Litmus Test Paper Book 80 Strips