Item Description: Gastec Tube 3L - Ammonia LR (0.5-78 ppm)
Measuring range is 1 to 30 ppm. Range can be extended to 0.5 to 1 ppm with 2 pump strokes and a correction factor of 1/2, and to 30 to 78 ppm with 1/2 pump stroke and a correction factor of 2.6. Box contains complete instructions.
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