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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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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

Product ID: 25479456

Details

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

📏15" telescopic shaft for tight spaces

📶Bluetooth 4.0 wireless connectivity

🌡️Accurate temp range -4° to 140°F

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¥39256

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌬️ Elevate your airflow game with testo 405i — precision meets portability in your palm!

COMPACT POWERHOUSE - Lightweight and rugged design means you carry precision and durability in your pocket, ready for any job site challenge.
REACH WHERE OTHERS CANT - Extendable 15-inch telescopic shaft lets you effortlessly measure airflow in the tightest ducts and vents.
PRECISION IN EVERY BREATH - Hot-wire sensor delivers ultra-accurate airflow and temperature readings, eliminating guesswork in HVAC diagnostics.
SEAMLESS WIRELESS WORKFLOW - Bluetooth 4.0 syncs instantly with your smartphone or tablet for remote monitoring and data logging on the go.
SMART DATA SMARTER DECISIONS - Use the Smart Probe App to visualize, store, and generate custom reports—perfect for professional-grade HVAC service.

The testo 405i is a professional handheld hot-wire anemometer designed for precise measurement of air velocity, temperature, and volume flow in HVAC systems. Featuring a 15-inch extendable telescopic shaft, Bluetooth 4.0 connectivity, and compatibility with the Smart Probe App, it enables remote readings, data storage, and custom reporting. Lightweight and rugged, it’s optimized for tight ductwork and on-the-go professionals seeking reliable, error-free airflow diagnostics.

Specifications

ASIN	B018VO5GI2
Best Sellers Rank	#18,704 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Anemometers
Brand Name	Testo
Customer Reviews	4.5 4.5 out of 5 stars (606)
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 Kilograms
Manufacturer	Testo
Material Type	Metal, Plastic
Measurement Accuracy	±0.9 °F / ±0.5 °C
Model	0560 1405
Output Type	Digital
Part Number	0560 1405
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	1.0 Count

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