Lightweight, precise & convenient: Air flow measurement with the testo 420 air flow hood.

Take it easy.

Light, precise and convenient – the volume flow hood testo 420 significantly facilitates the regulation of volume flow at larger air intakes and outputs. With only 2.9 kg, it is the lightest model on the market. And with the integrated flow straightener, it sets new measurement precision standards at swirl outlets.

This allows users to fulfil hygienic Indoor Air Quality (IAQ) guidelines and stipulations in ventilation and air conditioning systems quickly and precisely in industry production areas, offices, cleanrooms or even in classrooms.

Experience it for yourself now with a Special offer!

When you buy a testo 420 air flow hood* you will receive a FREE second hood/bag of your choice.

With different sized vents / air intakes - Testo offers different sized hoods/bags. With the limited offer you can choose from one of the following replacement hoods to complement your testo 420 air flow hood (610mm x 610mm) kit with part number 0563 4200.

Your choice from the following:

  • Replacement hood (360mm x 360mm) - 0554 4200
  • Replacement hood (305mm x 1220mm) - 0554 4201
  • Replacement hood (610mm x 1220mm) - 0554 4202

* FREE replacement hood/bag is via redemption only. Simply complete the form below to redeem. Promo period is from 20 May to 31 July 2022. While stocks last.

Air force one promo 2022

How to easily redeem your free hood

1. Purchase a testo 340 OR testo 350 analyser from a participating Testo Authorised Dealer before 30-Nov-2022  Dealer Search

Purchase a testo Smart Probes kit

   2. Register your purchase by completing the form below


Register online

     3. Relax and receive your choice of FREE technology.


Receive your FREE testo 745 Non-contact voltage tester

You can register here


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The following conditions apply to the participation in the Testo Bonus offer ("Promotion").

  1. Organizer

The organiser of the promo is Testo SE & Co. KGaA, Testo-Strasse 1, 79853 Lenzkirch, Germany (“Organizer”). The promo will be handled by Testo Pty Ltd, Unit 11, 114-118 Merrindale Drive, Croydon South VIC 3136, Australia, the agency contracted to do so by the organiser.

  1. Promotional object

The object of the promotion is the granting of a cost-free give away with the purchase of a defined Testo measuring instruments and the subsequent registration with sending in a copy of the invoice receipt or delivery note.

  1. Eligibility for participation

Eligible for participation are natural persons resident in Australia. Employees of the organiser, affiliated companies and other companies involved in the conception and implementation of the promo, as well as their relatives, are excluded from participation. Participation is possible from the age of 18 years.

  1. Participation in the promotion

In order to participate in the promo, the participant must purchase a promotional instrument from Provo Instrumentation, in the period from 5 October 2022 and 30 November 2022, whether in his/her own name or on behalf of a company. The participant must then register here on the Promo page and verify the purchase with a copy of his invoice or delivery note.

After the registration has been checked and confirmed, the give away will be sent to the participant. The customer has the possibility to complete the registration by 31 January 2023.

Each participant can only participate once in the promotion for each purchased promotional device. Multiple participations with different or several address data as well as other manipulative measures lead to the immediate exclusion of the participant from the promotion.

In return for participation in the promotion, the participant agrees that the organizer may process his personal data for advertising purposes (including personal product recommendations).

  1. Give away

After a successful eligibility check, every participant receives a give away in the form a Testo instrument or promotional product. The agency sends the give away to the participant by post. The risk of loss passes to the participant when the item is handed over to a transport person and the participant accepts these conditions of participation. Registered participants who are entitled to participate will generally receive the give away within 30 working days of successful verification of their registration at the specified address. If the give away cannot be delivered twice, the participant may be excluded from the promotion. In the event of unexpectedly high demand, there may be delays in delivery.

A cash payment is excluded. The right to the give away is not transferable.

  1. Liability

The organiser is not liable for any damages which occur in the course of the implementation of the promo, unless the organizer or his/her agent has caused the damage through gross negligence or intention or has violated a contractual (cardinal) obligation. In the case of slight violation of cardinal obligations, the liability of the organiser is limited to predictable, contractually typical damages. Liability in the case of culpable damage to life, body or health due to malicious concealment of defects is unaffected. Liability according to the product liability legislation is unaffected.

  1. Data protection

The data from the participants recorded in the framework of the promotion will be recorded, stored and used for the implementation of the promotion. The complete data protection information for the receipt of application-specific information is contained in the data protection declaration at Privacy Policy

  1. Other

These conditions for participation are subject to Australian law, excluding international private law and the UN Convention on Contracts for the International Sale of Goods.