Testo 535 Digital CO2 Measuring Instrument with App connection
What is the Testo 535 CO₂ Meter?
The Testo 535 is a professional-grade CO₂ measuring instrument designed for electricians and HVAC professionals who need reliable, accurate air quality readings on-site. Whether you're maintaining school HVAC systems, checking office ventilation, or ensuring safe CO₂ levels in commercial environments, this compact meter delivers fast, stable results every time.
Optimised for indoor air quality testing, the Testo 535 uses a long-term stable infrared sensor for high accuracy and repeatable readings. It's a trusted tool for UK electricians looking to comply with air quality standards, diagnose poor ventilation and ensure client safety.
How does the Testo 535 support everyday testing and commissioning?
This meter works seamlessly with the Testo Smart App to provide second-screen capabilities, quick configuration and automated report generation, ideal for electricians handling routine inspections or large-scale commissioning tasks.
Order today to enjoy free delivery, expert support and our 90-day satisfaction guarantee. Need advice? Our team is here to assist you.
Why choose Instrotech for your electrical test equipment?
With over 40 years’ experience supporting UK electricians, technicians and engineers, Instrotech is your trusted partner for quality tools and expert service. When you purchase from us, you benefit from:
Free UK shipping on all orders
Access to our knowledgeable technical support team
Available calibration services to maintain safety compliance
A 90-day money-back guarantee for complete peace of mind
We’re committed to helping you work safely and efficiently with industry-leading products and ongoing support.
