Item Description: Gastec Tube 3M - Ammonia MR (10-1,000 ppm)
Measuring range is 50 to 500 ppm. Range can be extended to 10 to 50 ppm with 2 to 5 pump strokes and a correction factor of 1/2 to 1/5, and to 500 to 1000 ppm with 1/2 pump stroke and a correction factor of 2. Box contains complete instructions.
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