Wager, an industry leader in smoke opacity meters, proudly introduces it's new Stack Check Emissions Monitor. Designed to monitor exhaust readings on large stacks,this updated smoke indicator effectively uses surface mount electronics and micro-processing technology, to allow for accurate readings processed right at the stack 

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You may use your existing stack penetrations, as well as dampers and aspirating flanges. If you want to keep the visual aspect of your older system, you may do so, and combine both systems.