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Your cart is empty. testo 405i – Digital Thermometer for measuring airflow, air velocity, and temperature on air conditioning systems
Measure air velocity, temperature, and volume flow with just one instrument - the durable testo 405i temperature probe provides reliable measurements and, if combined with the smart probe app, allows remote measurement readings. With its automatic calculations, the app erases the need for error-prone manual calculations. Merely download the testo smart probe app, take advantage of user-friendly readings and create custom reports that are quickly saved and retrieved.
The telescopic shaft is extendable and rotatable, making otherwise hardly accessible in-duct measurements of airflow fast and easy. The rugged housing protects the device from impact, making it extremely durable.
Technical Data:
Temperature measuring range: -4° to 140 °F / -20 to +60 °C
Temperature measurement accuracy: +-0.9 °F / +-0.5 °C
Velocity measuring range: 0 to 5906 fpm / 0 to 30 m/s
Velocity measurement accuracy: +-(19.7 fpm + 5 % of mv) (0 to 394 fpm) / +-(0.1 m/s + 5 % of mv) (0 to 2 m/s) / +-(59.1 fpm + 5 % of mv) (394 to 2953 fpm) / +-(0.3 m/s + 5 % of mv) (2 to 15 m/s)
Dimensions: 8 x 1 x 2 in. / 200 x 30 x 41 mm
Weight: 4.22 oz. / 119.6 g
System Requirements: requires iOS 8.3 or newer; requires Android 4.3 or newer; requires mobile end device with Bluetooth 4.0
Scope of Delivery:
testo 405i Bluetooth hot-wire anemometer, including 3 AAA batteries and certificate of calibration
camilo agudelo
2025-08-11 17:53:20
Very useful
Liz
2025-07-20 17:09:26
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.
John Post
2025-07-15 17:41:55
I bought this to measure traditionally low air volumes coming out of long horizontal vents (honeycombs) of refrigerated cases in grocery stores. This, as a commissioning engineer, helps me qualify if there is any blockage (ice buildups) or if a fan is out. Using it via blue-tooth on my smartphone was very easy. What I didn't like was the temperature measurement response. I was hoping it would respond quickly, but it doesn't. Measuring a refrigerated airstream (~32dF) from an environment of 70dF took about 15 minutes, before I got a consistent reading. For my job, this is much too long. So I will use the tool to measure air volumes only.
swhitting
2025-06-21 15:49:56
AC guy could not figure out why my air conditioner was icing up. With this meter I diagnosed low blower performance and he had to replace my defective blower under warranty. Fixed my air conditioner. On line videos show you how to use all the features. It works through you smart phone and is very accurate with multiple measurement methods.
david gentes
2025-06-10 19:30:57
Great product and works great
Brent Bergman
2025-05-31 16:28:49
Anemometers are used to measure air speed. Many use little propellers that spin with airflow, but if you need to measure airflow inside of an enclosed space Testo 405i is what you need. Place the Testo measurement probe thru a small hole and air speed is simple. Very easy to use and good value for the design
Lukasz Koplejewski
2025-05-07 15:29:51
Great tool for any HVAC tech
neezer
2025-04-26 16:30:10
Worked great with the Testo app, rather convenient! Got one use out it when it fell from my stepladder, hit the floor and the bulb wires separated. No external damage. Granted, DON'T drop them, but for the price, it should be able to take a little bounce from field use. Not worth sending it back to Testo, $25 upfront for handling before it is evaluated for an obvious bulb change (Testo does not sell a field replaceable bulb). Don't bang it or drop it. or maybe just buy one that's a little more robust or has a replacement bulb/wand for those times you do.
gurdeep
2025-04-25 17:12:56
Recommended products for all the gas techs, nice, accurate and convenient specially for air flow measurement. All over really good one, value for money.
Ricardo RamÃrez
2025-03-25 17:49:00
Excelente calidad!!
Artur Nowak
2025-02-01 16:40:57
Dobry Dobry Bardzo Dobry
Fil
2025-01-25 12:59:47
Lo strumento è facilissimo da usare e configurare; le misurazioni confrontate con altri strumenti risultano precise.Per l'uso è necessario installare l'app sul telefonino (io uso andorid) ma la configurazione è molto semplice.Pienamente soddisfatto
カスタマー
2024-12-27 16:37:23
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