TBProAudio has released dpMeterXT, a precise multi channel meter plugin supporting the EBU R128, ITU-R BS.1770/1771, ATSC A/85, and several other region specific audio/music loudness standards. It features large readouts, meters, graphs, measurement history, and data logging. dPMeterXT supports multiple channel configurations, from 1.0 up to 9.1/10.0, depending on your system configuration or DAW capabilities, and you can define measurement parameters in great detail.
TBProAudio dpMeterXT is available now for €79 (around $95). It requires macOS 10.5 or later and an AU, VST, RTAS, or AAX plugin host.