"Pete C." wrote in message
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PrecisioNmachinisT wrote:
"Pete C." wrote in message
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PrecisioNmachinisT wrote:
"Pete C." wrote in message
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wrote:
Beyond that, there are a few air filter monitors available that
monitor
airflow or pressure and indicate when a filter should be changed
similar
to the indicators on most truck air filters these days.
Airflow or pressure, which one?
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Both types exist.
I call bull****.
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You're apparently full of BS yourself then.
Here is a differential pressure type:
http://www.oxyclean.com/filter-sentry.html
Here is an airflow type: http://www.filtrometer.com/2023.html
Calibration traceable to NBS standards, no doubt...
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