Can you use it to measure air mass? Like kg / hour? And does it compensate for air temperature and air pressure?

It measures air velocity, period. Does not compensate for pressure or temperature. Does not measure air mass flow directly.

Can it calculate or convert to Feet per minute?

Here are the specs you are looking for: Measuring range: 0 to 6,000 fpm Accuracy: ±(20 fpm +5 % of m.v.) (0 to 394 fpm) / ±(59 fpm +5 % of m.v.) (394 to +3,000 fpm) Resolution: 1.97 fpm Volume flow: (cfm) 0 to 99,999 cfm (Resolution: 0.1 cfm)

Can you use it to measure the delta?

There's a trendline function that can keep track of changing temp over time.

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testo 405i Hot-wire Anemometer I Wireless Smart Probe for air velocity, in-duct airflow and temperature

Product ID: 386510290

Details

Brand
Testo
EU Spare Part Availability Duration
1 Years
Item dimensions L x W x H
20 x 3 x 4.1
Item weight
4.22 Ounces
Material
Acrylonitrile

📏Telescopic shaft extends to 15" for hard-to-reach spots

📶Bluetooth 4.0 wireless connectivity for remote readings

🌡️Accurate temp range -20 to 60°C with ±0.5°C precision

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€ 243.27

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In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌬️ Elevate your airflow game with testo 405i — where precision meets smart convenience!

REACH THE UNREACHABLE - Extendable 15" telescopic shaft lets you effortlessly measure airflow in tight ducts and confined spaces.
LIGHTWEIGHT DURABILITY - Compact 119g design with rugged housing ensures portability and resilience for professional HVAC servicing.
PRECISION IN EVERY BREEZE - Hot-wire sensor delivers reliable air velocity and temperature measurements with industry-grade accuracy.
SEAMLESS WIRELESS WORKFLOW - Bluetooth 4.0 integration pairs instantly with your smartphone for real-time remote monitoring and data logging.
SMART DATA SMARTER DECISIONS - Use the intuitive Smart Probe App to visualize, store, and generate custom HVAC reports on the fly.

The testo 405i is a compact, wireless hot-wire anemometer designed for professional HVAC and air conditioning diagnostics. It accurately measures air velocity, temperature, and volume flow with a telescopic shaft for hard-to-access ducts. Bluetooth 4.0 connectivity pairs with the Smart Probe App for remote readings, data visualization, and custom reporting. Lightweight and durable, it’s optimized for fast, reliable airflow analysis on the go.

Specifications

ASIN	B018VO5GI2
Brand	Testo
Brand Name	Testo
Customer Reviews	4.5 out of 5 stars 598 Reviews
EU Spare Part Availability Duration	1 Years
Global Trade Identification Number	04029547014260
Included Components	testo 405i hot-wire anemometer, 3 AAA batteries and certificate of conformity
Item Dimensions	20 x 3 x 4.1 centimeters
Item Weight	0.23 Kilograms
Item dimensions L x W x H	20 x 3 x 4.1 centimeters
Item weight	0.23 Kilograms
Manufacturer	Testo
Material	Acrylonitrile Butadiene Styrene (ABS)
Material Type	Acrylonitrile Butadiene Styrene (ABS)
Unit Count	1 Count
Voltage	4.5 Volts

Reviews

R**N

Dust Collection Balancing Game Changer

12.08.2025

M**D

Great product and delivery

31.01.2026

V**R

Muy útil

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

11.09.2019

B**A

Ottimo

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.

16.06.2023

R**Z

Calidad al 100

Excelente calidad!!

7.02.2025

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€ 243.27

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Italy.

Secure transaction

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