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This pH test paper allows you to accurately test the pH of various substances including food, water/aquariums, urine, soil, and more. Approximate size of pack 70 x 45mm pH 1-14 Colour chart in each pack.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 acidity