9 Tips to Extend the Life of your PortaCount™ Instrument   The PortaCount™ Respirator Fit Tester provides a consistent and objective respirator fit test in less than 2 minutes and half using OSHA protocol and allow users to see how respirator fit changes in real-time during donning and adjustment.  To get the most out of your instrument we have compiled a list of 9 tips that can help to have the PortaC...