This soil auger is used to sample soil vs. depth to depths of 6ft. Generally used in agriculture. Its an alternative to digging a trench with a backhoe.
I also used it in Napa to place watermark soil moisture sensors to depths of 4 ft. to gather information on water penetration useful in making irrigation decisions.
You can see what a new one costs here. https://www.ams-samplers.com/soil-auger-kits/ ~$400.