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Note: This is a "Special Order" product that cannot be exchanged and is non-returnable
The Honeywell Benzene Tubes have a standard range of 0.5 - 10 ppmv for a single stroke using the Honeywell Piston Hand Pump and an extended range of 0.25 - 30ppmv for additional strokes. Each box contains 5 tubes and 5 pre-tubes, allowing for 5 measurements.