Item Description: Gastec Tube 121L - Benzene LR (0.125-60)
Box contains 10 tubes: 5 detector tubes and 5 pretreatment tubes. Tubes connect with a rubber yoke (included) for testing. Box yields 5 tests. Measuring range is 0.25 to 12 ppm. Range can be extended to 0.125 to 0.25 ppm with 10 pump strokes and a correction factor of 1/2, and to 12 to 60 ppm with 1 pump stroke and a correction factor of 5. Box contains complete instructions.
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