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Just because they are not digital does not mean they are not accurate, a surprising value & there are no batteries to go dead! I installed my own furnace so I hit the books, studied the subject, found out that just about everyone is starving their HVAC systems for air with over pressuring a wrong sized ductwork system and could be wasting up to 1/3 of your heating & cooling dollars along with drawing far too much amperage in the furnace fan, wrong sizing the filters while using 1" filters that belong in the trash. There are good reasons to use the formulas available on the web from commercial installers, Learn about how useful these low pressure differential gauges are and apply the mathematics to saving you gobs of money.
Verified purchase: Yes | Condition: Pre-owned
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