Current from Hall effect sensor
Hall sensors measure magnetic field in [Tesla], which is a field that drops off in strength greatly with separation in gap distance.  Thus the most reliable method is to choose Current Sensors with all the current going thru a loop in the sensor.

here are 3 methods are :


ferrite toroid loop with conductor thru hole (current transformer, CT)
clam shell loop current probe with a degaussing circuit in case of saturation.(expensive probes) but has DC response.
Hall sensor chip with built in linear correction using &lt;= 1 milliohm current shunt in chip (like the ACS711)


Don't just put a Hall sensor on a wire loop near current conductor and expect to measure current. This is due to poor variable magnetic coupling.