testo 405i Anemometer Handheld for Air Celocity, In-Duct Airflow and Temperature – CFM Meter with Extendable up to 15" Telescopic Shaft - Wind Meter with Bluetooth and App Operation

I'm on my second one of these. I start up industrial dust collection systems and traditionally use a pitot tube and Dwyer digital manometer. I did several duct balancing trips where I used this and the traditional pitot tube and found this to be extremely accurate and much more user friendly so I now only use this. It has a max velocity of 6,000 FPM, so while it works for traditional dust collection it does not work for high performance applications (like Negative Lift systems). Its minimum temp is somewhere around -10 degF, so it does not work in extreme winter conditions. The bulb is sensitive to buildup, but less sensitive than my collapsible pitot tube. Eventually, the bulb does bend over and even if you straighten it the readings will be incorrect. That's when its time to throw it out and get a new one. Over all, I highly recommend.

Connects instantly to bluetooth at the press of the on button. Gives you temp & fpm flow continuously on a phone app. Nice telescoping probe. Compact quality tool. Used it for many hours so far on the original battery.

I use this to check the air flow in my HVAC system to determine when air filters need to be replaced. The bluetooth connection and the app work great. (Retired HVAC geek.🙂)

I wanted to use this sensor for an experiment. It is easy to use, but I could not mount it easily to my experiment. It would be nice if it had a way to mount it to a Swagelok or something like that. However, it was very easy to use.

I bought one of these Testo 405i hot-wire anemometer (basically a handheld version of the mass airflow sensor on your car engine) to measure duct air flow. After using it I liked it so much that I decided I needed a 2nd one so I can do return/supply measurements. Very handy & useful for any HVAC tech that takes their job seriously.

Buen equipo, fácil de utilizar

This works very well - exactly what I was looking for. A budget and user friendly way to spot-check our fume hoods to make sure they're still operating correctly between annual certifications.

Used this on a very important project where they were low on cfm after i changed the configuration my report was within 2 cfm of the tab contractors device love it super easy and accurate MUST HAVE FOR HVAC AND TAB PRO’S

Product is accurate and easy to use Delivery was so fast , actually reached before delivery date by 5 days Thanks Amazon

Funciona muy bien en los conductos. La app vincula rápido. Es cómodo para mover.

電池の持ちも良いし、手頃な価格で使える測定器

Pacco arrivato in orario ma con imballo spedizione da Amazon praticamente inesistente. Per fortuna la scatolina originale è robusta e tiene il prodotto ben saldo. Data la spesa credevo dedicasero più attenzione, per fortuna il corriere non l'ha "trattato male". Comunque prodotto funzionante e consigliato.

Excelente calidad!!