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Specification change - Nitrogen dioxide tube (117SA)
  2018.12.20
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Now 117SA tube is supplied using Diphenylamine as reagents and o-Toluidine which is considered as one of carcinogens is no longer used. Due to the reagents change, some of the specification has been changed as below.

  Old New
Colour change White→Yellowish orange White→Green
Detectable limit 5ppm 1ppm


Some of interferences has been changed as well. Read the instruction manual before use.


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