1984 Excella water tanks check
Fresh water testing plumbing, but not the tank itself.
This doesn’t achieve all of your requirements but attaching compressed air at about 40-50 PSI and performing a leak down test can at least find broken pipes and leaking fixtures.
I made mine from (inlet to outlet assy order) air coupling inlet fitting, ball valve, T fitting, pressure gage, male garden hose fitting.
It doubles as a winterizing blow out tool too.
Idea is to apply regulated compressed air to city water inlet pressurize the entire system then close ball valve to retain air in system and monitor pressure gage.
If pressure drops listen for air hissing. Air cleans up pretty easy and doesn’t rot wood.
But it has limitations for testing water systems but great for testing for leaks.
2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Carslile Actuator, Equal-i-zer, Dill TPMS. Campfire cook.