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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Description

🌬️ Measure Smarter, Work Faster – The Future of Airflow is Wireless!

EXTEND YOUR REACH - Telescopic shaft extends up to 15" for seamless in-duct airflow measurement.
LIGHTWEIGHT POWERHOUSE - Compact 4.2 oz design perfect for on-the-go HVAC pros and managers.
DATA AT YOUR FINGERTIPS - Smart Probe App transforms readings into actionable tables and graphs.
PRECISION IN EVERY BREEZE - Hot-wire sensor delivers ±0.5°C accuracy for air velocity & temperature.
CUT THE CORD NOT THE DATA - Bluetooth 4.0 syncs effortlessly with your smartphone or tablet.

The Testo405i is a compact, handheld hot-wire anemometer designed for precise measurement of air velocity, temperature, and in-duct airflow. Featuring a 15" telescopic shaft for hard-to-access areas and Bluetooth 4.0 connectivity, it pairs seamlessly with the Smart Probe App to provide real-time data visualization, storage, and reporting. Lightweight and portable, it’s the ultimate tool for HVAC professionals seeking accuracy and efficiency.

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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