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 Anemometer Handheld for Air Celocity, In-Duct Airflow and Temperature – CFM Meter with Extendable up to 15" Telescopic Shaft - Wind Meter with Bluetooth and App Operation

testo 405i Anemometer Handheld for Air Celocity, In-Duct Airflow and Temperature – CFM Meter with Extendable up to 15" Telescopic Shaft - Wind Meter with Bluetooth and App Operation

Product ID: 25479456

Details

Brand
Testo
Item Weight
0.23 kg
Item dimensions L x W x H
7.87 x 1.18 x
Material
Metal Plastic
Style
Wireless Smart

📏15" telescopic shaft for hard-to-reach spots

📶Bluetooth 4.0 wireless connectivity

🌡️Accurate temp range -4° to 140°F

€ 261.61

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌬️ Elevate your airflow game — measure smarter, not harder!

LIGHTWEIGHT POWERHOUSE - Compact and rugged design weighs just 4.2 oz, perfect for professionals who demand portability without compromise.
REACH WHERE OTHERS CANT - Extendable 15-inch telescopic shaft lets you effortlessly measure airflow deep inside ducts and vents.
SMART INSIGHTS ON THE GO - Use the Smart Probe App to visualize data in real-time, generate custom reports, and eliminate manual errors.
PRECISION IN EVERY BREATH - Hot-wire sensor delivers ultra-accurate airflow, velocity, and temperature readings with ±0.5°C accuracy.
CUT THE CORD NOT THE DATA - Seamless Bluetooth connection to your smartphone or tablet for remote monitoring and instant data logging.

The testo 405i is a professional-grade handheld anemometer featuring a 15-inch extendable telescopic shaft, Bluetooth 4.0 connectivity, and precise temperature and airflow measurement capabilities. Designed for HVAC pros and industrial use, it pairs with the Smart Probe App for remote readings, data visualization, and custom reporting, all in a compact, durable form factor.

Specifications

ASIN	B018VO5GI2
Best Sellers Rank	#25,928 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Anemometers
Brand Name	Testo
Customer Reviews	4.5 4.5 out of 5 stars (621)
Global Trade Identification Number	04029547014260
Included Components	testo 405i hot-wire anemometer, 3 AAA batteries and certificate of conformity
Item Dimensions	7.87 x 1.18 x 1.61 inches
Item Weight	0.23 kg
Manufacturer	Testo
Material Type	Metal, Plastic
Measurement Accuracy	±0.9 °F / ±0.5 °C
Model	405i
Number of Items	1
Number of Packs	1
Output Type	Digital
Part Number	0560 1405
Response Time	5 seconds
Sensing Distance	15 inches
Specific Uses For Product	HVAC inspections, air conditioning servicing, industrial and professional settings, confined spaces
Style Name	Wireless Smart Probe
Unit Count	1 Count

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€ 261.61

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered 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 Greece.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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