Soil Sample Measuring Spoon
The soil sample measuring spoons are made from PVC to be durable and to avoid any possible contamination of the sample by metals or other measured elements. The spoons are designed to deliver a specified volume of soil sample. The design, with respect to shape, diameter, depth, etc. , was arrived at through research done by several soil analytical laboratories to determine what design gave the most repeatable measurement of sample.
After a heaping fill of the sample spoon with dry crushed and sifted soil, strike the metal spoon shaft one time with the round PVC leveling rod and then with that rod level with one stroke the spoon head. This will give you the most repeatable measurement.