AIOMEST Digital Anemometer AI-100APP Wind Speed Measuring Device Android/iPhone Compatible W/Data Logging for Air Flow Velocity Wind Temperature Wind Chill Gauge Tester

I am a ham radio operator that volunteers to spot storms for SkyWarn through my county's ham club ARES team. This anemometer is part of the ARES kit I keep in my truck. Most people vastly overestimate wind speed when guessing based on observation. It's not uncommon for a thunderstorm to produce 25 to 30 MPH wind, which the NWS categorizes as a "strong breeze." A 30 MPH gust will move patio furniture and trash cans but isn't a serious threat to most buildings and vehicles. 40 MPH is when you start to see minor damage (e.g., small branches breaking off of trees) and anything 50 MPH and above starts to get dangerous. Since reporting conditions accurately is critical when storm spotting, having an anemometer to get an accurate reading helps a lot. When I am able to report "30 sustained with 42 MPH gusts, measured" the SkyWarn Net Control and NWS have useable information. Try it yourself: guess at the wind speed then measure. Don't feel bad if you overestimated wind speed! That and hail size are the two most frequently misreported parts of storms.This anemometer is a good size, fits in an adult hand, and is easy to use. The display is easy to read and the backlight helps at night. It reads wind speed from either direction so you don't need to turn around to face into the wind. Runs on 2 AA batteries (included) and there is room in the included carrying case for a set of spare batteries. (And a small ruler for measuring hail.) There is a tripod mount on the bottom for continuous monitoring but I use the included wrist strap so I don't need to worry about dropping it. I haven't compared the readings with a known calibrated unit but I do get readings within a few percent of measured wind speed reported by NWS and other spotters. If you need to accurately measure wind, this is an affordable tool.

For those not in the HVAC profession this low cost device is good enough to satisfy your curiosity for measuring airflow. Not sure of its accuracy when measuring wind speed but I imagine its within ballpark. Tricky thing to measure airflow in any case because it depends on location and placement of the device. I can say air temperature readings are 2-3 degrees off when comparing to dial thermometer I used simultaneously. Device was useful and low cost enough for what I required.

It did not come with the stick handle that it shows

Immediate Bluetooth connection to my phone. It's simple to use and works great.

I knew I had a duct or two that was either partially or fully disconnected. Didn't want to crawl around all under the house, so I was able to pinpoint the two floor registers with low air flow and RECONNECT THE DUCTS.

I found a small tripod at the thrift store that is perfect for this. I have used it a few times and it works just as advertised. It registers the slightest breeze. I have had it out in gusts up to 18mph so far.

What a piece of garbage! Can't calibrate it to the known pressure in your house, it just shuts off, or it goes to alt. in meters! Tired of getting junk from Amazon and even they cant seem to put me in touch with Aiomest!

Big vanes, so it's able to spin even at very low wind speed, 0.4 mph. That makes it too big for a pocket however. Good quality instrument at a low price.