Item Description: Gastec Tube 1LM - Carbon Monoxide LR (25-2,000 ppm)
Measuring range is 50 to 1000 ppm. Range can be extended to 25 to 50 ppm with 2 pump strokes and a correction factor of 1/2, and to 1000 to 2000 ppm with 1/2 pump stroke and a correction factor of 2. Box contains complete instructions.
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