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

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 hard-to-reach spots

📶Bluetooth 4.0 wireless connectivity

🌡️Accurate temp range -4° to 140°F

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¥39426

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Description

🌬️ Elevate your airflow game—measure smarter, work faster, impress always!

DATA DRIVEN DECISIONS - Instantly generate, save, and share custom reports with graphs and tables to impress clients and streamline workflows.
REACH WHERE OTHERS CANT - Extendable 15-inch telescopic shaft lets you effortlessly measure airflow deep inside ducts and vents.
PRECISION IN EVERY BREATH - Hot-wire sensor delivers ultra-accurate airflow, velocity, and temperature readings to eliminate guesswork.
CUT THE CORD NOT THE CONTROL - Bluetooth-enabled for seamless remote monitoring via the Smart Probe app—stay hands-free and efficient.
BUILT FOR THE FIELD READY FOR ANYTHING - Rugged, lightweight design fits in your toolkit and withstands tough HVAC and industrial environments.

The testo 405i is a compact, handheld digital anemometer designed for precise measurement of air velocity, temperature, and volume flow in HVAC and industrial settings. Featuring a 15-inch extendable telescopic shaft and Bluetooth 4.0 connectivity, it pairs with the Smart Probe app for remote readings, data logging, and custom reporting. Rugged and lightweight, it’s engineered for professionals who demand accuracy and convenience in tight or hard-to-reach spaces.

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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¥39426

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In stock

Sold byAmazon JapanDelivered 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 Japan.

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