I live in an apartment and do not have access to the circuit breaker panel. In the summer I run two AC units, and have inadvertently tripped the breaker before while running my vacuum cleaner. This caused a big hassle, as I had to wait for the super to get home so he could go down and flip the breaker back. I'd like to avoid this ever happening again, as 1/3 of my apartment was without power for about 6 hours that day.
When it happened, I made note of which outlets went out, so I now know all the outlets on that circuit. I'd like to be able to differentiate between the outlets on the remaining two circuits, so that I can space my high-draw appliances out evenly and avoid future issues.
What I'm looking for is a device (or pair of devices) I can purchase that will allow me to check two outlets and see if they are on the same circuit. I've seen circuit breaker testers that come with one device which you plug into an outlet, but the other end requires that you have breaker access and wand the device over the breaker or something similar to check. As I mentioned, I do not have access to the breaker, so this is not an option. Ideally there would be a pair that I can plug into two separate outlets, and have one of them tell me whether they are connected or not. My searches online haven't yielded any results on a device like this, so I'm curious if there's any way to do it from within the apartment, without breaker access and definitely without tripping any breakers.
Not accepting answers that say "turn off your AC before running the vacuum" or any such thing. Obviously in the future I will make sure that I turn them off, but this is more a question of load-balancing my devices which do have to run simultaneously.