---
product_id: 543491510
title: "425 Anemometer with Telescopic Probe – Hot Wire Anemometer Handheld for Air Flow Temperature Measurement in Ventilation Ducts – Range of 0.01 to 5906 fpm – Airflow Meter with App Compatibility"
brand: "testo"
price: "€ 1003.36"
currency: EUR
in_stock: true
category: "Testo"
url: https://www.desertcart.nl/products/543491510-425-anemometer-with-telescopic-probe-hot-wire-anemometer-handheld-air
store_origin: NL
region: Netherlands
---

# Telescopic probe extends to 820mm Seamless app integration & remote display Accurate temp range -20 to 70°C 425 Anemometer with Telescopic Probe – Hot Wire Anemometer Handheld for Air Flow Temperature Measurement in Ventilation Ducts – Range of 0.01 to 5906 fpm – Airflow Meter with App Compatibility

**Brand:** testo
**Price:** € 1003.36
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** 425 Anemometer with Telescopic Probe – Hot Wire Anemometer Handheld for Air Flow Temperature Measurement in Ventilation Ducts – Range of 0.01 to 5906 fpm – Airflow Meter with App Compatibility by testo
- **How much does it cost?** € 1003.36 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/543491510-425-anemometer-with-telescopic-probe-hot-wire-anemometer-handheld-air)

## 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

- • **Rugged design built for fieldwork:** Compact, durable housing withstands tough HVAC environments
- • **Extended reach for hard-to-access ducts:** Telescopic probe stretches up to 820mm for effortless overhead or large duct work
- • **Precision airflow & temperature readings:** Pinpoint measurements from 0.01 to 5906 fpm with ±0.5°C accuracy
- • **Smartphone-powered control & documentation:** Use the app to configure, monitor, and archive data in real-time
- • **Instant averages & volume flow calculations:** Automated time and point averages speed up your workflow

## Overview

The Testo 425 Anemometer is a handheld hot wire airflow and temperature meter designed for HVAC professionals. Featuring a telescopic probe extending up to 820mm, it delivers precise airflow readings from 0.01 to 5906 fpm and temperature accuracy within ±0.5°C. Its rugged build and app compatibility enable seamless remote monitoring, data storage, and documentation, making it an indispensable tool for efficient ventilation duct analysis.

## Description

The Testo 425 Anemometer – Quick & easy determination of Air Flow and Temperature Measurement in Ventilation DuctsWith the 425 Anemometer control of air quality of in-duct systems has never been more convenient or precise. Thanks to the app compatibility, the air temperature thermometer is set up and configured in minutes and ready to go. In addition, the App not only supports you in configuring the measuring instrument and takes over display, storage and documentation of the measured values – it also turns your smartphone into a second display.Time and point average values are automatically calculated allowing for a fast determination of the airflow and velocity. The cable-connected telescope can also be extended up to 820 mm, making it easier to work overhead or in large diameter ducts.Technical Data:Temperature – NTC Measuring range: -20 to +158 °F / -20 to +70 °CAccuracy: +-0.9 °F / +-0.5 °CResolution: 32.2 °F / 0.1 °CVelocity - Thermal anemometer Measuring range: 0.01 to 5906 fpm / 0.01 to 30 m/sAccuracy: +-(5.91 fpm + 4.0 % of mv) (0.01 to +3937 fpm) / +-(0.03 m/s + 4.0 % of mv) (0.01 to +20 m/s) / +-(98.4 fpm + 5.0 % of mv) (20.01 to +5906 fpm) / +-(0.5 m/s + 5.0 % of mv) (20.01 to +30 m/s)Resolution: 1.97 fpm / 0.01 m/sWeight: 9 oz. / 268 gDimensions: 5 x 2 x 1 in. / 135 x 60 x 28 mmOperating temperature: -4 to +122 °F / -20 to +50 °CProbe: -4 to +158 °F / Probe: -20 to +70 °CHousing: ABS + PC / TPEDiameter probe shaft: 0.295 in. / 7.5 mmCable length: 4.921 ft. / 1.5 mProtection class: IP40, IP20Length probe: 7.087 in. / 180 mmBattery type: 3x AABattery life: 35 hStorage temperature: -4 to +122 °F / -20 to +50 °CScope of delivery:testo 425, Transport bag, Calibration protocol, 3 x AA batteries

## Features

- PRECISE; The Testo 425 wind meter is the ideal instrument for efficient and accurate determination of air flow and temperature in ventilation ducts of air conditioning or ventilation systems
- CONVENIENT; Thanks to automatic calculation and display of time and point averages, as well as volume flow, the wind speed meter achieves fast and reliable results
- ACCESSIBLE; The integrated cable-connected telescopic probe of the wind gauge can be extended up to 820 mm which makes measurements in overhead or lager diameter ducts easier
- ROBUST; The wireless hvac gauge with its compact design is equipped with an extremely sturdy housing allowing for carefree application in rough conditions
- APP CONNECTION; Conveniently display graph history, and view, store, and document all measured values directly from your testo gauges hvac on your Smartphone and Tablet - or use them as a second display

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BT2V13X1 |
| Batteries | 3 AA batteries required. (included) |
| Best Sellers Rank | #407,048 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #53 in Anemometers |
| Date First Available | January 25, 2023 |
| Item Weight | 9.5 ounces |
| Item model number | teso 425 |
| Language | English |
| Manufacturer | Testo |
| Product Dimensions | 1.1 x 2.36 x 5.31 inches |

## Product Details

- **Brand:** Testo
- **Item Weight:** 268 Grams
- **Item dimensions L x W x H:** 1.1 x 2.36 x 5.31 inches
- **Manufacturer:** Testo
- **Material:** Plastic

## Images

![425 Anemometer with Telescopic Probe – Hot Wire Anemometer Handheld for Air Flow Temperature Measurement in Ventilation Ducts – Range of 0.01 to 5906 fpm – Airflow Meter with App Compatibility - Image 1](https://m.media-amazon.com/images/I/51SzTup9yYL.jpg)

## Frequently Bought Together

- Testo 425 Anemometer with Telescopic Probe – Hot Wire Anemometer Handheld for Air Flow Temperature Measurement in Ventilation Ducts – Range of 0.01 to 5906 fpm – Airflow Meter with App Compatibility
- 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

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-02-12*