Handheld Anemometer, Anti-dust CFM Meter With Touch Button, Rechargeable Wind Speed Gauge for Air Flow, Chill, Temp Test, Waterproof LCD Backlight

I’m no engineer but I think it works, was having trouble with a sandblast dust collector and wanted to see what the cfm was as opposed to what it claims to have. It helped me get it working as it should. It has a lot of options, I only used the cfm function. Great price for a tool that comes in handy.

I immediately tried putting this to work diagnosing a split system with excessive coil sweat: airflow measured within spec, but temp read was 15 degrees off. Both probe and temp gun clocked the air at 54, this read it at 69. I didn't buy it for that feature, but it could cause the unwary some issues. Like that is chargeable rather than taking batteries, but it's lack of temperature calibration makes me distrust it's accuracy in reading airflow. As I've no other instrument to check against it and the read was reasonable, I'm willing to run with it for now.

I just needed this unit to provide general CFM reading which it does quite well. It also can perform numerous other measurements which I have not pursued. It appears well made and is fairly simple to operate.