AC circuit tester

http://www.campingworld.com/shopping/item/digital-line-monitor/24900

Here is what I have

Along with the yellow polarity tester shown above.

You would be surprised how low the voltage gets in a park during the summer when everyone has the A/C going.

This unit works well using a standard rv adapter. It can be used for troubleshooting inside the rig and for adjusting genset.Prime 120 volt tester

Hi,

Here is what I use:

kill-a-watt

watt meter



Outlet tester.

outlet tester

Any inexpensive multi-meter will do it and is a very handy tool for home and RV.

You can always pick up one of these for about $7 to check for correct polarity....LINK