- Soil test - who does it? 
- List of PE degrees - . Civil, structural, architectural, agricultural engineers relate to this.
- For construction - pocket penetrometer - 
- For agriculture - Cost of tool is $200 [https://extension.psu.edu/diagnosing-soil-compaction-using-a-penetrometer-soil-compaction-tester#:~:text=A%20penetrometer%20will%20cost%20around%20%24200.
- Includes howto
- Converting pocket penetrometer reading to kpa with factors for virgin or disturbed etc soil