How to test voltage between neutral and ground
A simple multimeter can help you verify all three, as well as many other voltage related troubleshooting.  It's a real must have for... anyone really.

To measure between neutral and ground, you will set the meter to AC voltage, 200V range, and stick one probe into the neutral slot of the socket (the wider slot for USA standard sockets, on the left if the ground hole is on the bottom) and one probe into the ground slot (the D shaped hole).