Reasonably priced cable/circuit tracer for 4" walls?

[frazzled]

I see circuit tracers priced from $25 to 1000s of dollars. I guess that the cheap ones won't do. I can find the circuit breaker. I want to find where the NM cables run inside the walls and perhaps ceilings, so that I have some hope of finding where it is mis-wired. So all I need is a tracer that can detect the cable (either energized or not) through a layer of 1/2" drywall up to 4" deep in the wall.

 

[daviddarwin]

Sensitivity adjustment is necessary for the user to gather the right amount of signal. It also helps prevent false-positives and interference from other wires. Sensitivity adjusts through automatic and non-automatic means until the lone connection, being the point of transmission, is left.

 

[UNG]

I see circuit tracers priced from $25 to 1000s of dollars. I guess that the cheap ones won't do. I can find the circuit breaker. I want to find where the NM cables run inside the walls and perhaps ceilings, so that I have some hope of finding where it is mis-wired. So all I need is a tracer that can detect the cable (either energized or not) through a layer of 1/2" drywall up to 4" deep in the wall.

You have quoted prices but what is your budget if it is a one off job you maybe better to look at possibly hiring one