UNI-T Digital Anemometer UT363BT Handheld Wind Speed Meter Wind Chill Air Temperature Gauge -14° ~122°F /-10°C~50°C for HVAC Shooting Drone with LCD Backlit Max/Avg Data Hold

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This UNI-T UT363BT is my first anemometer and it's pretty fun. I've got some other UNI-T meters so knew their quality. I've used it to measure fans, comparing airflow on different speeds, and to measure the spread (traditional versus tower fans). I've also used it to measure PC case fans. I was hoping to be able to measure slight air currents in the room but it's not sensitive enough for that. The app is great for sticking the meter inside some small space and still being able to see the measurement. It eliminates the need for a propeller on a wire, which would make the unit more delicate. The app is pretty clunky and if you've changed the overall font size on your phone, the temperature pushes off the bottom of the screen. The app does improve things somewhat in that it shows two decimals for the wind speed, and gives quick access to the max, avg, and hold buttons. Logging works and can be exported to an excel spreadsheet file for easier analysis and manipulation. It can't measure low wind speed, despite product specifications saying 0-30m/s. I can have a breeze barely spinning the propeller for tens of seconds but get 0.0 on screen. Then as as I gently increase air speed it jumps to 0.4, oscillating between 0.0 and 0.4, then jumps to 0.8, then the next jump is 1.0 (1.05 in the app). The resolution is listed as 0.1m/s but it's really 0.4 at the low end. Part of the limitation is the small propeller, but even when it picks up some rotation the meter can show 0.0 so it's also a processing issue. I'm thinking that for light breeze a DIY ribbon hanging will be far more sensitive than any propeller-based unit can be. The reading jumps around a lot, but the averaging feature greatly improves the stability (and increases precision in the app since it shows two decimal places). The hold feature is useful when measuring where you can't see the screen but don't have it connected via the app. Near some electric motors it gives false readings up to 4.3m/s when the propeller isn't spinning. With one small air purifier it does this over two feet away from the unit! I wonder why they don't use an optical mechanism to detect the spinning propeller.

Buen producto precio calidad

The unit works and it’s a good price, but it does not pick up low speed airflow. Not as good as more expensive units made by kestrel.

This anemometer/thermometer appears to give good readings, to the extent I can test it. It's easy to hold and easy to read. I wish the selected units didn't reset every time I turn it off. If you want MPH and Fahrenheit it'll take four short clicks and one long one on the units button to get there, every time you turn it on. And I wish there was a case or some protective covering. My tests include the following: --*- Measure the outside temp, along side a trusted thermometer: 85.2 vs 84. I may not have let the trusted thermometer settle long enough. See first pic. --*- Measure the inside temp beside the same trusted thermometer: 72.6 vs 73. Note the trusted thermometer doesn't read in tenths. See second pic. --*- Take it down to my dock where the winds were light but of steady direction. I took a short video showing my windsock in the background and this device in the foreground. Notice when the windsock indicated the wind picked up, the anemometer reading increased as well. It's also good the anemometer can read such low wind speeds. Its sensor (fan blades) is quite sensitive. Based on my long time reading of wind on the water (as a long time sailor) I find the anemometer to be a good indicator of low wind speeds. --*- Blow a keyboard cleaner (wind generator) into the sensor from about six inches away. The cleaner puts out a good burst, with three settable velocities. I have no idea what the wind speeds are for it. In the last three images I uploaded (not allowed to upload second video) you can see, on average, the anemometer showing increasing speeds as I step the cleaner up through its three settings. I can believe it's pushing more than 40 MPH of air at the end. So, I find this anemometer acceptable for my uses (mostly sailing and flying a drone). It beats the old tube with a ball in it I used decades ago (and you can still buy here on Amazon for about $70). One star off for not retaining setting, and no case/cover. The device itself seems fine.