Education and Communications What is soil grinder? What is soil grinder? Soil grinders are laboratory tools that are effectively used to reduce agglomerations of caked soil to individual grains with repeatable results. The use of soil grinders saves time and money as compared with the use of mortar and pestle methods. Related Posts:Will any grinder work for espresso?What meat grinder should I buy?Can you grind coffee beans with a magic bullet?How to Scribe for a Perfect Fit Using a Woodworking is a video on Amazon.com.