HP-816B

I'm an amateur astronomer and wind speed is an important environmental factor that affects the quality of the images I take. It is important that wind speed for my particular equipment not exceed about 1.5 mph. This little gadget tells me the instantaneous wind speed and the maximum wind speed and that's all I need to know. Please note that the device works by the wind moving a propeller, so the measurement is directional. You will be getting the wind speed in whatever direction you hold the device. If you need to know the wind speed independent of direction, you may want to consider another device (such as a hot-wire anemometer) that reads wind speed in all directions.

This is a very compact and simple device that measures linear wind velocities and air temperatures. It is an economical tool to use when balancing air ducts in a home or measuring wind profiles for wind energy generators.

Product should be good but does not work for my special needs. Numbers are too small for my eyesight.

Look elsewhere if you are going to use this to test dust collection systems or anything that moves a lot of air. It has a fairly low max speed, so measuring higher amounts of airflow is a bust. Make sure you want it for lower volume. It seems cheaply made, but is what you pay for at this price point.

Works exactly as it should.

Wanted to measure output of one of my shop air filters between different manufacturers of filter brands and this thing lasted all of 15 seconds. Was a pretty cool 15 seconds though. Seemed accurate. It just stopped reading anything giving me flat zeros.

I needed it to check very low wind speeds of 0 - 8 mph. It works just fine.

Use it regularly in my profession ( forest ranger ).