I'm not an electrician. Per, https://www.apc.com/us/en/faqs/FA158817/, I want to test the outlets in a room for the following:
- Overloaded neutral wire (>5 Volts AC measured between Neutral and Ground).
- Reversed polarity (hot and neutral wires are reversed).
- Missing ground wire. (Note: this also includes using a 3 prong to 2 prong adapter)
I've found simple plug-in devices on Amazon that I'm confident can test for #2 and #3, but what sort of tool do I need for #1, to measure the voltage between Neutral and Ground?