Dwyer® Magnehelic® Differential Pressure Gage, 2001D, 0-1" w.c. & 0-250 Pascals

Our furnace air filters are "out of sight, out of mind." So, we flush mounted this gauge in the wall next to the thermostat as a visual reminder indicating when the filters actually need replacement. It compares the vacuum behind the filters to the ambient room air pressure. With the gauge, we no longer have to rely solely on the appearance of dirty filters. Installation was easy and looks sharp.

Arrived in perfect condition even though it was listed as refurbished. Works perfectly for setting up my ERV system

Dwyer gauges are top notch! I installed this as a furnace filter gauge to measure pressure drop across our 20x25x4 inch filters. Now that I have a baseline with a clean filter, I can measure exactly when the filter is dirty.

Must have for pellet stove people wanting to tune, understand and maintain your stove. I would not be without it and I keep it mounted on the wall behind my stove at all times. Really helps let you know if something changes or a seal starts to leak causing the vacuum drop and you can see it.

Nice gage and works well.

I purchased 4 of these to show negative pressure while doing disaster relief in healthcare and they are working awesome for my needs

Love this gauge! Works excellent. I use it on my air handler, I have it always hooked up admit works fantastic.

I am using the Magnehelic gauge to correct my home duct work sizes. I presently have too much restriction on on my return air duct. I will be ordering larger ducts from a local HVAC supplier.