Question about Litmus paper

Yup.
 
1 cup of water.
Measure PH.
If <6 or >8, adjust with a few drops of vinegar or a dash of baking soda.
Add 1/2 cup dirt.
Stir well and let settle.
Measure water on surface.  
Done.
 
Preferable to use distilled or RO, you'll get a much more accurate reading.
 
Take samples from multiple areas and soil horizons.
 
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