PORTACOUNTT PLUS SCBA MASK FIT TESTER TSI Inc.: OSHA-compliant device performs quantitative fit testing for a variety of mask styles, including those used with SCBA. Optional N95-Companion permits fit testing for disposable masks used against TB. WindowsT-based FitPlusTM software allows complete automation of fit test process; documents results and generates reports. (800) 926-8378, ext. 2759.