understanding manometer maximum pressure spec


Old 11-05-17, 12:32 PM
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understanding manometer maximum pressure spec

I want to buy a manometer for checking/learning about hvac and air quality issues at home. E.g. pressure difference between crawlspace and living area.

I'm not fully understanding the maximum psi specification. One brand of manometer comes in 3 models, each with a different maximum PSI: 0.5psi, 2psi, 5psi. They all have 0.001psi resolution.

So wouldn't the 5psi model be the best? Why would anyone buy the 0.5 psi model?

I already have a pyle PDMM01. Don't know if there's something wrong with it -- everything I want to measure reads 0. E.g. pressure difference between indoor and outdoor when furnace is on. But I know it's not zero because a contractor once measured and showed it to me with his manometer.
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Old 11-05-17, 03:00 PM
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I'm not an expert on manometer's but I have used them for years. To me the most accurate would be the .5 psi.
Old 11-05-17, 05:32 PM
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It also depends on your requirements.

I always get the 2 psi models.
.5 psi would be the most accurate ( and usually more expensive) but it would be limited to only duct pressures.

Inlet gas pressure could exceed double the capacity of that model.
The 2 psi model would also check gas pressures.

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