Manometer, Professional Air Pressure Meter, Dual-Port HVAC Digital Manometer Gas Pressure Tester,12 Selectable Units Differential Pressure Gauge, (Included Battery)

Worked great helping me diagnose a damaged heat exchanger in my furnace. Price was great!

Seems to be well made and accurate. Used it to test low side gas pressure on my 2 stage gas valve. Easy to read and use. Includes battery and tubing along with instructions. Make sure and zero the reading before taking your reading.

I had to change out the gas regulator in my furnace and needed a manometer to adjust it after. This worked great for that. I don't think I would buy this if I was a HVAC tech and used it everyday. But for someone like me who will use it once every year or two as a routine furnace check, or swapping a gas valve, this is perfect.

Wasn't too sure when opened package. Not as duribly built as I had hoped. Needs more and longer hoses, and some T fittings would be nice. Includes a battery which was helpful. Meter worked well but I am still concered about build quality.

Only thing is I wished it had more fittings to fit different applications like my Ronna tankless water heater. But did come with one just wasn’t the size I needed. But that was fine. . Simple to use and instructions really could use some work. But for the price it worked well. I compared to a manometer analogy. And it was accurate

I bought this to diagnose an air pressure switch problem in a heating system. A pressure switch that's supposed to close when experiencing a 1.5" WC (Water Column) amount of negative pressure wasn't closing, so I bought this to determine if the switch was bad, or if I have a problem/leak in the combustion chamber (heat exchanger). If you're unaware, pressure as measured in "inches WC" is WAY more sensitive than PSI. I think the conversion is something like 1 PSI is equal to like 27.7 inches water column. And I needed something to detect 1.5 inches water column, which is 0.054 PSI. Many of the analog gauges just aren't good at picking up really low pressures like that. But, one of the modes of this meter is to measure in inches WC, so I decided to try it. The one thing I noticed is, just sitting there, not connected to anything the gauge reads negative 0.27 inches WC, so it's claiming there's a slight vacuum in regular air, which seems unlikely. So, when I connected it to the heating system, it read 1.57 inches WC, so I wasn't sure if that was really 1.57, or if I needed to manually subtract out the 0.27 reading. I wish there was a way to zero the meter out, meaning, I'm at regular atmospheric pressure for my temperature, let's call that zero, so that when I measure the appliance (heater), I can see the delta from normal, but with the extremely short users manual that comes with this, I don't see a way to do it. In the end, the meter showed I had negative pressure in the combustion chamber, which is what's supposed to happen (to prevent carbon monoxide build up), so I guess it worked, I just don't know how accurate it was. But good enough for the weekend HVAC repairer like me.

Bf says it works for the price

Works great.

Accurate satisfactorily! Good enough for fluid mechanics lab equipments. Only for gases. And connected appropriately, the pressure is safely carried by the air in the connecting pipes to this gauge ! Can rely on Pascal to read liquid pressures