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.

Deliver to Tunisia

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testo 405i – Anemometer handheld for air velocity, in-duct airflow, and temperature – CFM meter with Bluetooth and App operation

testo 405i – Anemometer handheld for air velocity, in-duct airflow, and temperature – CFM meter with Bluetooth and App operation

Product ID: 25479456

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Details

Brand
Testo
Material
Metal Plastic
Item dimensions L x W x H
7.87 x 1.18 x
Item Weight
4.22 Ounces
Global Trade Identification Number

📏Telescopic shaft extends to 15"

📶Bluetooth 4.0 wireless connectivity

🌡️Accurate temp range -20 to 60°C

Description

🌬️ Measure smarter, not harder — airflow insights at your fingertips!

DATA DRIVEN DECISIONS - Smart Probe App transforms raw data into intuitive graphs and custom reports—no manual math needed.
REACH THE UNREACHABLE - Extendable 15-inch telescopic shaft lets you measure airflow deep inside ducts effortlessly.
LIGHTWEIGHT POWERHOUSE - Compact 4.2 oz design ensures portability without compromising rugged durability for professional HVAC servicing.
PRECISION IN EVERY BREEZE - Hot-wire sensor delivers ultra-accurate air velocity and temperature readings with ±0.5°C accuracy.
SEAMLESS SMART INTEGRATION - Bluetooth 4.0 syncs instantly with your smartphone for remote monitoring and data logging.

The testo 405i is a compact, handheld hot-wire anemometer designed for precise measurement of air velocity, temperature, and in-duct airflow. Featuring a telescopic shaft extending up to 15 inches and Bluetooth 4.0 connectivity, it pairs seamlessly with the Smart Probe App for remote readings, data visualization, and custom reporting. Lightweight and rugged, it’s the ultimate tool for HVAC professionals seeking accuracy and convenience in one sleek device.

Specifications

Brand	Testo
Material	Metal, Plastic
Item dimensions L x W x H	7.87 x 1.18 x 1.61 inches
Item Weight	4.22 Ounces
Global Trade Identification Number	04029547014260
Manufacturer	Testo
Part Number	0560 1405
Item Weight	4.2 ounces
Product Dimensions	7.87 x 1.18 x 1.61 inches
Item model number	0560 1405 01
Batteries	3 AAA batteries required. (included)
Is Discontinued By Manufacturer	No
Size	small
Color	Black/Orange
Style	Wireless Smart Probe
Thickness	Not applicable Inches
Voltage	4.5 Volts
Item Package Quantity	1
Number Of Pieces	1
Measurement Accuracy	±0.9 °F / ±0.5 °C
Special Features	Measurement data is transmitted to the convenient and powerful testo Smart Probes App in your smart device, Measures air velocity, volume flow, and temperature, Measures in-duct air flow and automatically calculates volume flow (enter duct dimensions simply), Small dia. (Perform air duct leakage tests, Tough, accurate, and easy-to-use
Included Components	testo 405i hot-wire anemometer, 3 AAA batteries and certificate of conformity
Batteries Included?	Yes
Batteries Required?	No
Battery Cell Type	Alkaline

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