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If you get it down far enough that reach that pl-259 take loose and from inside the house take the other loose and test it. That's why you bought it right? Test it at the highest AC volt for insulation testing. It is either good or bad. Fluctuations in the read could indicate failing dielectric due to moisture.


These meters can also read Volts AC/DC and resistance.

NEVER EVER TAKE A RESISTANCE READING IN A LIVE CIRCUIT.