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The revolutionary OHD QuantiFit2® fit tester is here! The QuantiFit2 is the fastest and most accurate fit testing device on the market today! Stay in compliance and test anywhere (outside included) with the QuantiFit2 and its optional battery packs. The Q2 also has the ability to test multiple people simultaneously with the use of OHD LOGIC software. Stop having to generate and count particles and use the Q2's controlled negative pressure technology!