H12 Digital Anemometer Handheld Wind Speed Meter with Extended Wind Sensor, Measures Wind Speed Wind Flow Temperature and Humidity CFM Air Flow Velocity Meter with Big Backlit Screen

Works as designed

During annual AC inspection I was curious about technician readings and wanted to gauge cold air output during air conditioning season. This unit's readings were comparable to the professional gauge which now allows me to measure air volume and temperature to measure output efficiency.

I bought it for it's "extending" feature. However, it hardly stretches. You can buy a non extending one for half the price, either way you will have to stretch your arm.

Nice anemometer for the money. Does what I need for HVAC work. Had to read the manual, play around with it for awhile, read the manual again, and play around with it some more just to figure it out. Minus 1 star for the manual. ANYONE KNOW WHAT THE LITTLE CLOCK ICON DOES??? Nothing in the manual except to say it's a timing symbol.

I use this for a high school science lab. It works great.

Used once and it broke the fan potion came disconnected from the handle

This anemometer is a great for higher wind speeds over 100 mph.

I've been dissatisfied with the airflow distribution of my home's ac system. I'll use this anemometer to get a better idea of the airflow coming out of each vent, and hopefully make some adjustments to the ac ducts.I wasn't sure what to think about the handheld sensor, but now after using it - I like it, in many areas of my home it has saved me from climbing up and down a ladder. For my situation this works better (especially the extension) than an "all in one" unit would.One of the reasons I chose this model was because it did Not use a 9v battery, but rather AA. And I'm pleasantly surprised that it also works with the lower voltage Nimh AAs (though even with a fully charged nimh batteries the display does show a "low battery" indication). I always have extra AA batteries ready to go, so this works perfectly for me. Thankfully I won't need to worry about leaky alkaline batteries ruining this device.I have no way to verify the accuracy of this device. Fortunately for my use, the absolute accuracy is not that important. The device does seem reasonably well made, and the impeller spins very freely with just the slightest amount of air over it. The only issue seems to be that the impeller is not balanced, as one blade always wants to swing to the bottom when it stops spinning.Overall I'm very happy with this meter, it's gotten me the data I need. Now with the cooler weather I need to go into the attic to see what changes I need to make to fix the airflow distribution.