Bonvoisin Hotwire Anemometer Handheld CFM/CMM Air Flow Velocity Meter Wind Speed Gauges with Backlight LCD Display for HVAC in-Duct Airflow Air Velocity Temperature(Thermal Anemometer)

Building a solar kiln needed to check airflow. Now we use in house and rental properties.

Wand failed to retract after extended. Hope they don’t deny refund

This is a fun tool to use to see how much air is actually flowing out of the vents. I could not figure out the settings and how to set it up but my husband is in the HVAC field and got it right away. He said it could assist a tech if needed. It’s small, lightweight and wouldn’t take up extra space in a tool bag or rack in a service vehicle. The value is reasonable for the quality.

In a dead air room, barely moving the fan forward or backward slowly would cause it to spin and put out a reading of .055m/s. Now that's sensitive.The device is 2 pieces so you gotta hold it with 2 hands which some may like and some might not. The fan does not have any way to hold it in place like a tripod mount but the device itself has one. I would've preferred if the fan had any kind of mount.The temperature reacts really, really slowly. I put it behind my computer which is pumping out pure heat. After about 10 seconds the reading only changed by .5 degrees Fahrenheit. It would probably take a few minutes for the temperature to read true.

This product can show velocity and airflow as well as temperature (although I'm not sure if it's dewpoint, wet bulb or regular). I'm not sure where the temperature sensor is. You can have it show you min, max, avg results, and one button switches you from vel. to AF. When you switch, however, anything you had set is erased, so you'll need to change settings again. It has a separate button to input the 2D (LxW) of the area for airflow, but not 3D unfortunately. The vane's blades are mounted at a 45 degree angle and are completely flat, so you can use either side of the vane to take readings. The vane is mounted on a 150mm telescoping tube so you'll need both hands to operate this, use something like a tripod, or put the meter down. The cable for it runs through the middle of the tube, sliding through as you extend it. You can't apply a magnet to the back unless you glue it in place as there are no ferrous materials on the back. You can also send the results to your computer with the included software. It comes with 4 AAA batteries and a protective rubber "sleeve", a USB cable to connect the meter to your computer, a mini-CD with the software, and instructions, all inside a hardshell carrying case.Unfortunately, there are some shortcomings.1) I noticed that when I didn't use max/min, I would see higher readings than was shown when max was on.2) I also noticed that readings were not consistent even though the fan speed was set to max or min.3) The temperature sensor registered an increase in temperature as I was measuring the fan. Once the speed was high enough, it started to cool off. This, to me, seems to suggest that the temperature sensor is placed in an area of friction within the vane assembly, or it could just be registering the fan's increase in temperature due to friction. I tried asking Bonvoisin on here, but they didn't understand my question.4) When the velocity/AF was very low, the blades couldn't pick up the air movement because they are flat and at a 45-degree angle. If the blades had been shaped to capture air with a concavity, that probably wouldn't have happened.5) Although it's much better at picking up low readings than the ProtMex I tried, it still lacks the degree of sensitivity needed to test PC fans and, if you're measuring breezes, you might find it a bit challenging, too.6) I think the vane is not mounted directly to a motor but, rather, is mounted on the hub with, possibly, bearings. I could hear a slight noise as it spun.7) Changes in readings are delayed by a few seconds, which makes it hard to quickly find the strongest air current, unlike the ProtMex.8) If you don't know where the strongest air current is, you'll have to keep moving the head a bit, waiting a few seconds until the reading stabilizes, and then move again until you find what you're looking for. This can eat up a substantial amount of time, even in a very small area like my wind tunnel.9) It is not good at measuring wind from a distance of even 120mm if the velocity is very low because of the vane design.