I have a digital multimeter, but I'm having the worst of luck testing whether a circuit breaker I have is working properly, or if it is a different issue with the wiring in the circuit box. I first used this video as an instruction, but failed to realize that although the video doesn't say it, it is important to make a distinction between the common lead and positive lead. I almost fried my multimeter. Not wanting to try that again, I figured the best approach would be to turn off the main power, remove the circuit, and test the resistance instead. I can't seem to get a reading at all on the breaker no matter what I do. Can someone provide better instructions?
I know it is a problem with a single circuit (either the breaker or the wiring for that circuit) because all of the other circuits and breakers are functioning properly. This happened after I plugged a light into an outlet, and thought I saw a small spark. Nothing on that circuit is working now.