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0-4 & 0-80 ppm Ammonia Comparator
Increments:
0, 0.25, 0.50, 0.75, 1.0, 1.5, 2.0, 3.0, 4.0 ppm0, 5, 10, 15, 20, 30, 40, 60, 80 ppm
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