When normal devices can not reach far enough or function quickly sufficient, Mighty Probe is the tool for the job

https://kylerbrpj576.zenbloomer.com/posts/the-best-way-to-locate-a-septic-system-with-a-mighty-probe

When common devices can not get to far sufficient or work quick enough, Mighty Probe is the device for the task, offering you the depth, rate, and control needed to get it done.