mvMeter2 is a multivariable meter including RMS, EBUR128, VU and PPM measurement. mvMeter2 is the successor of mvMeter and adds single/dual meter display, adjustable reference level for all meter modes, adjustable meter delay and preset management.
Features

behavior of classic analog VU and PPM meters
multiple measurement modes : PEAK, RMS, EBU R128, VU and PPM
multi channel metering : stereo, left, right, mid, side
NEW : single and dual meter display
NEW : adjustable reference level for all meter modes
NEW : adjustable meter delay
NEW : preset management
adjustable pre-gain including gain matching
instance label
large and accurate live meters
64-bit internal processing
5 different meter themes
GUI resizing up 400%, ready for 4k displays
free of charge

https://www.tb-software.com/TBProAudio/mvmeter2.html