When common tools can not reach far enough or function quickly sufficient, Mighty Probe is the device for the job
https://finnsubv917.capitaljays.com/posts/exactly-how-to-locate-a-septic-system-and-use-a-septic-tank-filter-hook
When normal devices can not reach much enough or work quick enough, Mighty Probe is the tool for the task, offering you the depth, rate, and control required to obtain it done.