Monitoring Electricity and Surge protection - Tools - he-ruide
I check the camp ground post volts by pluging this multimeter into the 30 amp out put.  Note -  I cut the end off a extra pair of probes and added a 15 Amp plug.  This is then plugged into a 30 amp male to 15 amp female adapter (black).

I check the camp ground post volts by pluging this multimeter into the 30 amp out put. Note - I cut the end off a extra pair of probes and added a 15 Amp plug. This is then plugged into a 30 amp male to 15 amp female adapter (black).