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 Thermal anemometer with smartphone operation (0560 1405)

Testo Thermal anemometer with smartphone operation (0560 1405)

Product ID: 300383696

Details

Brand
Testo
Item Weight
4.22 Ounces
Item dimensions L x W x H
20 x 3 x 4.1
Material
Voltage
4.5 Volts

📏400 mm telescopic shaft

📱Bluetooth smartphone integration

🌡️Measures velocity, temperature & volume flow

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₨6982

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Description

📊 Elevate your airflow insights—measure smarter, not harder!

EXTEND YOUR REACH - Telescopic shaft extends up to 400 mm for precise access in tight ducts.
USER FRIENDLY SETUP - Easily configure duct dimensions and geometry within the app to instantly calculate volume flow.
LIGHTWEIGHT DURABLE - Crafted from manganese steel, weighing just 119.6 g—built for professionals on the move.
SMART WIRELESS CONTROL - Seamlessly connect via Bluetooth to the testo Smart Probes App for real-time data on your phone or tablet.
TRIPLE MEASUREMENT POWER - Simultaneously track air velocity, temperature (-20 to +60 °C), and volume flow for comprehensive airflow analysis.

The Testo 405i Thermal Anemometer combines a 400 mm extendable probe with Bluetooth connectivity to deliver precise measurements of air velocity, temperature, and volume flow. Compatible with iOS and Android devices, it offers intuitive app-based operation and duct configuration, making it an essential tool for HVAC professionals seeking accuracy and convenience in airflow diagnostics.

Specifications

ASIN	B018VO5GI2
Best Sellers Rank	#10,239 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #10 in Anemometers
Brand	Testo
Brand Name	Testo
Country of Origin	Germany
Customer Reviews	4.5 out of 5 stars 598 Reviews
Global Trade Identification Number	04029547014260
Importer Contact Information	Testo India Pvt. Ltd., Plot No. 23, Sind Society, Baner Road, Aundh, Pune - 411007. Maharashtra, Contact: +91 20 25920204, E-mail: [email protected]
Included Components	Extendible (400 mm) telescope and calibration protocol included
Item Dimensions	20 x 3 x 4.1 Centimeters
Item Type Name	Thermal anemometer with smartphone operation
Item Weight	0.23 Kilograms
Item dimensions L x W x H	20 x 3 x 4.1 Centimeters
Manufacturer	Testo SE & Co. KGaA, HQ Titisee-Neustadt, Commercial Register Freiburg i. Br. HRB 715057, testo
Manufacturer Contact Information	Testo SE & Co. KGaA, HQ Titisee-Neustadt, Commercial Register Freiburg i. Br. HRB 715057
Material	manganese_steel
Material Type	manganese_steel
Packer Contact Information	Testo India Pvt. Ltd., Plot No. 23, Sind Society, Baner Road, Aundh, Pune - 411007. Maharashtra, Contact: +91 20 25920204, E-mail: [email protected]
Thread Type	Npt
Unit Count	1 Piece
Voltage	4.5 Volts

Reviews

R**N

12.08.2025

M**D

31.01.2026

V**R

11.09.2019

B**A

16.06.2023

R**Z

7.02.2025

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