Your Autistic Life 
I've taken possession of my apartment. No big issue.
The rental office employee did not expect me to show up with a circuit tester. I discovered that dinning room circuit has an open neutral.
The employee mumbled something about folks testing circuits by plugging something like a phone charger.
There are a number of conditions that the phone charger test won't tell you about. More importantly,
THE PHONE CHARGER MAY WORK, BUT THE CIRCUIT MAY STILL BE DANGEROUS!!!!!!!
If you want to do to a decent job testing a circuit, you need a circuit tester.