Geoprobe® Systems 4.25 Continuous Sampler

To learn more click here: https://geoprobe.com/tooling/spt-sampling-325-425-hollow-stem-auger 

Hollow stem soil sample auger is turned to the desired depth with a pilot bit blocking the off the auger ID. The pilot bit is pulled and a split barrel sampler (split spoon) is lowered. The drop hammer is then placed on top of the rod string and the number of blows to advance the sampler is counted. The pilot bit can then be placed back in the soil sample auger and the auger string advanced to the next testing depth.