Item Description: Gastec Tube 121 - Benzene (2.5-120)
Measuring range is 5 to 60 ppm. Range can be extended to 2.5 to 5 ppm with 4 pump strokes and a correction factor of 1/2, and to 60 to 120 ppm with 1 pump stroke and a correction factor of 2. Box contains complete instructions.
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