I'd stay away from the super cheap meters despite the results of that testing. My own personal experience is that my cheap $5 meter is often off by more than 10V when trying to measure line voltage. Example, LV on my Fluke = 122VAC, on the $5 Harbor Freight = 110VAC. Pretty shitty if you ask me. I use that meter as a fuse now, as in "I wonder if this measurement will blow up my meter".