Good price on that, I have one and the db meter is great for tuning and trying different boxes etc. Plus it has the Epi built in with a volt meter.
But the meter is temperature sensitive. Tool me a long time to figure out why I was 4 db's louder on the way home from work than I was on the way in //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif