---
product_id: 25479456
title: "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"
brand: "testo"
price: "S$233"
currency: SGD
in_stock: true
reviews_count: 13
category: "Testo"
url: https://www.desertcart.sg/products/25479456-405i-anemometer-handheld-for-air-celocity-in-duct-airflow-temperature
store_origin: SG
region: Singapore
---

# 15" telescopic shaft for hard-to-reach airflow Bluetooth 4.0 wireless smart app connectivity Accurate temp range -4° to 140°F ±0.9°F 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

**Brand:** testo
**Price:** S$233
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** 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 by testo
- **How much does it cost?** S$233 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/25479456-405i-anemometer-handheld-for-air-celocity-in-duct-airflow-temperature)

## Best For

- testo enthusiasts

## Why This Product

- Trusted testo brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Yet Rugged:** Lightweight and impact-resistant design ensures durability and portability for demanding fieldwork.
- • **Data-Driven Decisions:** Smart Probe App transforms raw data into clear graphs and custom reports, empowering professional-grade insights.
- • **Reach Where Others Can't:** Extendable 15-inch telescopic shaft effortlessly accesses tight ducts and vents for comprehensive airflow analysis.
- • **Precision in Every Breath:** Hot-wire sensor delivers ultra-accurate airflow and temperature readings, eliminating guesswork in HVAC diagnostics.
- • **Wireless Workflow Freedom:** Bluetooth-enabled smart probe syncs with your smartphone for remote monitoring and instant data logging on the go.

## Overview

The testo 405i is a professional-grade 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 logging, and custom reporting. Lightweight and rugged, it’s optimized for tight ductwork and professional inspections, making it an indispensable tool for HVAC technicians seeking accuracy and efficiency.

## Description

testo 405i Digital Anemometer handheld for measuring airflow, air velocity, and temperature on air conditioning systems Measure air velocity, temperature, and volume flow with just one instrument - the durable testo 405i temperature probe provides reliable measurements and, if combined with the smart probe app, allows remote measurement readings. With its automatic calculations, the app erases the need for error-prone manual calculations. Merely download the testo smart probe app, take advantage of user-friendly readings and create custom reports that are quickly saved and retrieved. The telescopic shaft is extendable and rotatable, making otherwise hardly accessible in-duct measurements of airflow fast and easy. The rugged housing protects the device from impact, making it extremely durable. Technical Data 405i: Temperature measuring range: -4° to 140 °F / -20 to +60 ° Temperature measurement accuracy: +-0.9 °F / +-0.5 °C Velocity measuring range: 0 to 5906 fpm / 0 to 30 m/s Velocity measurement accuracy: +-(19.7 fpm + 5 % of mv) (0 to 394 fpm) / +-(0.1 m/s + 5 % of mv) (0 to 2 m/s) / +-(59.1 fpm + 5 % of mv) (394 to 2953 fpm) / +-(0.3 m/s + 5 % of mv) (2 to 15 m/s) Dimensions: 8 x 1 x 2 in. / 200 x 30 x 41 mm Weight: 4.22 oz. / 119.6 g System Requirements: requires iOS 8.3 or newer; requires Android 4.3 or newer; requires mobile end device with Bluetooth 4.0 Scope of Delivery: testo 405i Bluetooth hot-wire anemometer, including 3 AAA batteries, certificate of calibration

Review: Dust Collection Balancing Game Changer - I'm on my second one of these. I start up industrial dust collection systems and traditionally use a pitot tube and Dwyer digital manometer. I did several duct balancing trips where I used this and the traditional pitot tube and found this to be extremely accurate and much more user friendly so I now only use this. It has a max velocity of 6,000 FPM, so while it works for traditional dust collection it does not work for high performance applications (like Negative Lift systems). Its minimum temp is somewhere around -10 degF, so it does not work in extreme winter conditions. The bulb is sensitive to buildup, but less sensitive than my collapsible pitot tube. Eventually, the bulb does bend over and even if you straighten it the readings will be incorrect. That's when its time to throw it out and get a new one. Over all, I highly recommend.
Review: I liked it so much I bought another - I bought one of these Testo 405i hot-wire anemometer (basically a handheld version of the mass airflow sensor on your car engine) to measure duct air flow. After using it I liked it so much that I decided I needed a 2nd one so I can do return/supply measurements. Very handy & useful for any HVAC tech that takes their job seriously.

## Features

- Reliable; The hot wire handheld anemometer provides precise measurements of air velocity, temperature, and in-duct airflow, and can calculate volume flow when duct dimensions are provided
- Practical; The hinged, telescopic shaft of the cfm meter extends up to 15", making it easy to measure airflow even in tight ducts, vents, or other hard-to-reach areas during HVAC inspections
- Portable; This compact windflow meter is lightweight and easy to carry, saving time and effort and making it suitable for personal and professional servicing of air conditioning or HVAC systems
- Wireless; Equipped with Bluetooth 4.0, the air flow meter connects effortlessly to smartphones or tablets, allowing users to take accurate remote readings without being tied to the device
- Smart; The Smart Probe App for testo gauges hvac provides convenient instrument readings as tables and graphs. All measured data collected with the anemometer can be stored, retrieved, or included in custom reports

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B018VO5GI2 |
| Best Sellers Rank | #32,022 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Anemometers |
| Brand | Testo |
| Brand Name | Testo |
| Customer Reviews | 4.5 out of 5 stars 623 Reviews |
| 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 |
| Item dimensions L x W x H | 7.87 x 1.18 x 1.61 inches |
| Manufacturer | Testo |
| Material | Metal, Plastic |
| 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 | Wireless Smart Probe |
| Style Name | Wireless Smart Probe |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Testo
- **Item Weight:** 0.23 kg
- **Item dimensions L x W x H:** 7.87 x 1.18 x 1.61 inches
- **Material:** Metal, Plastic
- **Style:** Wireless Smart Probe

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/41jIXLuWH9L.jpg)

## Questions & Answers

**Q: Can you use it to measure air mass? Like kg / hour? And does it compensate for air temperature and air pressure?**
A: It measures air velocity, period. Does not compensate for pressure or temperature. Does not measure air mass flow directly.

**Q: Can it calculate or convert to Feet per minute?**
A: 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)

**Q: Can you use it to measure the delta?**
A: There's a trendline function that can keep track of changing temp over time.

**Q: Does this device show a live CFM reading?**
A: Why yes it does sir

## Customer Reviews

### ⭐⭐⭐⭐⭐ Dust Collection Balancing Game Changer
*by R***N on August 12, 2025*

I'm on my second one of these. I start up industrial dust collection systems and traditionally use a pitot tube and Dwyer digital manometer. I did several duct balancing trips where I used this and the traditional pitot tube and found this to be extremely accurate and much more user friendly so I now only use this. It has a max velocity of 6,000 FPM, so while it works for traditional dust collection it does not work for high performance applications (like Negative Lift systems). Its minimum temp is somewhere around -10 degF, so it does not work in extreme winter conditions. The bulb is sensitive to buildup, but less sensitive than my collapsible pitot tube. Eventually, the bulb does bend over and even if you straighten it the readings will be incorrect. That's when its time to throw it out and get a new one. Over all, I highly recommend.

### ⭐⭐⭐⭐⭐ I liked it so much I bought another
*by B***R on July 31, 2026*

I bought one of these Testo 405i hot-wire anemometer (basically a handheld version of the mass airflow sensor on your car engine) to measure duct air flow. After using it I liked it so much that I decided I needed a 2nd one so I can do return/supply measurements. Very handy & useful for any HVAC tech that takes their job seriously.

### ⭐⭐⭐⭐⭐ Easy to use anemometer
*by B***N on July 14, 2024*

Anemometers are used to measure air speed. Many use little propellers that spin with airflow, but if you need to measure airflow inside of an enclosed space Testo 405i is what you need. Place the Testo measurement probe thru a small hole and air speed is simple. Very easy to use and good value for the design

## Frequently Bought Together

- testo 405i – Anemometer handheld for air velocity, in-duct airflow, and temperature – CFM meter with Bluetooth and App operation
- Testo 605i | Thermohygrometer for Indoor Temperature and Humidity Measurement | with Bluetooth Support
- Testo 0560 1510 510I Differential Pressure Manometer Smart and Wireless Probe, 1" Height, 1" Width, 6" Length

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.sg/products/25479456-405i-anemometer-handheld-for-air-celocity-in-duct-airflow-temperature](https://www.desertcart.sg/products/25479456-405i-anemometer-handheld-for-air-celocity-in-duct-airflow-temperature)

---

*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-10-09*