) The Best Harvest Soil Sampler Probe easily obtains samples of soil for testing purposes. Attach to 1/2" drill to obtain soil samples 5/8" diameter and up to 18" deep. Use cleanout rod to push core sample into one-gallon storage bag, eliminating handling and contamination of sample. Allows one person to bag multiple samples quickly. Soil Sampler probe tip is smaller than the shaft diameter, keeping samples loose to eliminate clogging.