Guys, I can't say that the meter I used is 100% correct but it is our work one and is calibrated once a year, i have checked it's cal due date which is September. As I've said before please don't get to anal about it, those that have the loud systems know they are too loud, I would suggest those who are unsure it would pay to get tested again somewhere.
My hks hyper was always between 107 and 109 db wherever I got it tested,which was much the same as using our work meter.