TSI FitPlus was the software companion to the now-retired Portacount Plus 8020, 8028, and 8095 respirator fit testing systems. And, as the fit testing devices were upgraded, so was the software.
Why do you need a windscreen on a noise dosimeter microphone? Quite simply, it blocks out outdoor wind noise by creating a dead air space around the suspended microphone.
Back in late 2012 and early 2013, the EPA finalized changes to the Clean Air Act standards for area source and major source boilers. (40 CFR 63, subparts JJJJJJ and subpart DDDDDD respectively). The deadline for completing initial tune-ups is coming up fast: March 21, 2014, and the deadline for submitting notification of compliance status for tune-ups is July 19, 2014.