Apple - Audio meter tool?

I'm on 10.10 and the Orban Loudness Meter no longer works properly (it's unreadable).

Audio Hijack lets you set up three style of meters: Peak/RMS, VU meters, and menubar meters. You don't have to be recording. It costs $50 but will work for 10 minutes each session before inserting static into the audio.

I'd start with Piezo and move up to Audio Hijack Pro if needed.

It's small, gorgeous, and minimal and you get some nice old school VU meters showing the left and right channels.

Another tool is audacity. It has a stereo level monitor. See http://audacity.sourceforge.net/ Audacity is free and open source, but it's a recorder and editor, which may be more than you want.