Item Description: Gastec Tube 121S - Benzene Low Aromatics (2-312 ppm)
Box of 10 tubes contains 5 detector tubes and 5 pretreatment tubes. Tubes connect with a rubber yoke (included) for testing. Box yields 5 tests. Measuring range is 5 to 120 ppm. Range can be extended to 2 to 5 ppm with 4 pump strokes and a correction factor of 0.4, and to 120 to 312 ppm with 1 pump stroke and a correction factor of 2.6. Box contains complete instructions.
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