Used my Sound Devices 722 and Jez Riley French made contact microphones to record my garden door which was having a jolly good time creaking.
Came across this donationware plugin bundle that includes a nice looking R-128 analyzer. Have a look for yourself: http://www.meldaproduction.com/freevstplugins/mloudnessanalyzer.php It even supports 7.1! That alone is worth a lot more for a loudness meter, but this also comes with a ton of other toys. Nice one.