Bumping up an old'ish thread, I was reading some other threads on RL today and found a link to the following $38 Manometer that appears identical to the one below in JFP's picture:
https://www.amazon.com/gp/product/B00N3PPZZY/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
According to the reviews/comments, folks think that the Chinese company that makes the higher priced manometers has released this unit under their own name and reduced a lot of markup.
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This is the exact same manometer as the Pyle and the Supco. It appears that the Chinese manufacturer who makes all of these meters is now selling direct to the public without the ridiculous markup. I tested this meter against a few of my other manometers and it is exactly the same....
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I just bought one and will report back on how it does on my AOS. I have tubing and stuff to make a manometer from a DIY somewhere so I may do that as well and compare to this.
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Originally Posted by JFP in PA
You need a digital manometer that reads accurately in inches of water:
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