Since 2010 we have performed SPT Hammer Energy Measurements for standard penetration test hammers to get efficiency ratings which can then be used to adjust blow count N values to a normalized N60 value. This is sometimes called a Hammer Calibration, Hammer Energy Calibration, Hammer Energy Test, SPT Hammer Energy Measurement Test and other variations.

The field tests are performed in accordance to ASTM 4633. The tests follow with a calibration report of the energy transfer ratio measurement for each sample interval recorded. A more detailed report with raw field data records, charts and graphs of recorded SPT hammer energy measurements is available for an additional charge.