








📊 Measure Smarter, Work Faster – The Future of Airflow Testing is Here!
The testo 405i is a Bluetooth-enabled thermal anemometer smart probe designed for precise measurement of air velocity, volume flow, and temperature in ventilation ducts. Featuring a telescopic probe extending up to 400mm and seamless integration with the testo Smart Probes App, it offers professionals an intuitive, accurate, and portable solution trusted globally with over 60 years of Testo expertise.






| ASIN | B018VO5GI2 |
| Best Sellers Rank | 7,137 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 5 in Anemometers |
| Brand | Testo |
| Country Of Origin | China |
| Customer Reviews | 4.5 4.5 out of 5 stars (596) |
| EU Spare Part Availability Duration | 1 Years |
| Global Trade Identification Number | 04029547014260 |
| Item Dimensions | 20 x 3 x 4.1 centimetres |
| Item Type Name | Bluetooth Thermal Anemometer Smart Probe |
| Item Weight | 4.22 Ounces |
| Manufacturer | testo |
| Material | PE_(Polyethylene) |
R**A
Five Stars
Perfect product for the application
A**Y
450i anemometer: works fine
The 450i anemometer worked fine (screenshot attached). I did the math using the cross-section area of the duct, and the number was within 5% of than the rated output of the blower that I was to create the air flow. The app was easy to install, but asked access to my contacts and location. The manufacturer should offer options to disable this, and should not bundle reviews for all smart probes into one. Please offer the case with foam inserts to keep the probes. Thanks!
R**G
UTTER RUBBISH!!!
UTTER RUBBISH! THE BLUETOOTH CONNECTION LASTED FOR JUST A FEW MINUTES AND THEN DISCONNECTED ITSELF AND IT WON'T RECONNECT. THE INSTRUCTION MANUAL IS TOTALLY USELESS AND I HAVE ABSOLUTELY NO IDEA HOW TO TRANSMIT DATA FROM THE PROBE TO MY PHONE. IT IS GOING STRAIGHT BACK TO WHERE IT CAME FROM!
K**L
Four Stars
good
H**R
unable to get calibrated and bluetooth connection erratic
Unable to get calibrated and bluetooth connection erratic. Fast response time % poor damping algorithm. Unsuitable for repeatable readings at lower velocities.
R**N
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.
M**D
Product is accurate and easy to use Delivery was so fast , actually reached before delivery date by 5 days Thanks Amazon
V**R
Funciona muy bien en los conductos. La app vincula rápido. Es cómodo para mover.
B**A
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.
R**Z
Excelente calidad!!
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