HVAC Anemometer,CFM Air Flow Meter 0.001~100mph High Accuracy Measures Wind Speed/Wind Temp/Air Velocity Air Flow, Professional CFM Meter AP-846A with Backlight Max/Min/Avg

I bought this to balance the airflow from the HVAC vents in my home, because we have some hotspots. This works great, it's sensitive enough to pick up very low air volumes, which is essential for balancing. You can't do volume testing with this, you'd need a different piece of equipment, but for air speed, this works great.

The unit seems to be reliable, I have tested it against a airflow hood and came within about 4 percent of the hood readings. The unit is easy to use and navigate. I purchased this as a replacement vane anemometer and so far satisified.

Air blows threw and does an accurate reading. Great product

Meter needs improvement with instructions as well as their illustrations. It's not difficult to figure out but I would think people return them because of this issue, meter seems to work satisfactorily.

Been using this for helping architect the ductwork for a laser machine in the home, see CFM results instantly as you change the design. I'm planning to use it to make the most efficient ductwork design in the workshop for dust extraction from the different wood working tools.

I got satisfactory data for what I needed it for. The accuracy seems to be OK The averaging feature does seem to work OK. The user manual is terrible. It's the worst chinglish I have run into in a long time. The data recording feature did not work the way I think the manual says it should and the software provided did not work with WIN 10. Effectively, it does not have the data recording feature advertised. Update - also could not get the software to work with WIN XP.

As expected and fast shipping.

Needed to check for CFM from an 8" Exhaust port and balance lateral. The anemometer made it simple by just inputting the area of the duct. Does it what it should, protective case is decent.

I can't speak to the absolute accuracy of this device, but it works great, even at very low air flows, and is easy to use. delivery was super fast. I'm using it to diagnose weak airflow in some sections of household ductwork.

Only backlit button should be given seperate and long term on .

We have previously bought this item a few years back. It works perfectly, accurate, can measure really low wind speed. So we bought a second one. it cannot measure like the first one. It works, it is just not precise enough.

This is a decent meter for the money, however it doesn't have the ability to measure humidity. That's the only reason why I returned it.

I mean the fan needs substantial amount to start spinning. I think the fan needs to be perfectly perpendicular to the air/wind source for it to be accurate. the backlight is so annoying... stays on for a second then turns off. the display is hard to read.. needs to be in your face in a well lighted environment for the numbers to make sense. the device is awkward to use as you need 2 hands to operate. one hand holds the fan sensor and the other hand holds the main unit. you need a third hand to hold the ladder you're stepping on and another hand to hold your laptop as it needs a cable to connect.