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TWA (Time Weighted Average) Tubes

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  1. 500 - TWA-CARBON MONOXIDE (5-400ppm)

  2. 501 - TWA-AMMONIA (5-200ppm)

  3. 502 - TWA-HYDROGEN SULPHIDE (1-20ppm)

  4. 503 - TWA-SULPHUR DIOXIDE (0.5-20ppm)

  5. 504 - TWA-TOLUENE (20-200ppm)