Get the job done.
Be connected.
Pair devices, capture readings, share reports.
Discover the new smart HVAC/R World of Testo.
Leader in high-accuracy HVAC/R measurements
Refrigeration, Heating, or Climate Control – Testo Has You Covered.
From everyday HVAC/R challenges to complex measurement tasks, Testo tools deliver precision and reliability. Paired with the intuitive testo Smart App, managing your devices and generating reports is faster, smarter, and easier than ever.
Why Testo
Comprehensive portfolio: Save time and simplify your processes with individual instruments and complete solutions.
Future ready: Meet the demands of new technologies such as hybrid systems new refrigerants with confidence.
Fully connected: Work efficiently with parallel measurements, remote control and centralised data management.
Always up to date: Benefit from workflow improvements through regular testo Smart App updates.
Our top performers
With Testo instruments, you’re fully equipped to tackle any HVAC/R task.
testo 558s
Digital manifold for refrigeration and heat pumps
Intuitive operation, wireless probes and App connectivity
testo 300 NEXT LEVEL
Flue gas analysis made fast and simple
Parallel measurements and easy documentation via App
testo 400
Universal climate instrument for ducts and IAQ
Guided menus and expandable with a wide probe portfolio
Work Smarter
Effortlessly extend the capabilities of your measurement devices and enjoy intuitive workflows across refrigeration, heating, and climate control. With smart menus and seamless device integration, your HVAC/R tasks become easier, faster, and more reliable.
The right device for every HVAC/R job
Refrigeration technology
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Heating technology
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Ventilation & IAQ
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Thermal imaging
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Refrigeration technology
Work smarter. Not harder.
Whether you’re installing refrigeration systems or servicing heat pumps,
Testo devices and accessories make every measurement task straightforward, accurate, and digitally connected.
Designed for HVAC/R professionals, Testo combines smart technology with reliable performance.
Testo: Your Partner for All Things Refrigeration
Testo delivers the most powerful refrigeration ecosystem on the market. Your one-stop shop for manifolds, smart app integration, and all essential accessories. From evacuation to charging, we accompany you at every task and challenge, ensuring you get the job done smarter, faster, and reliably.
testo 558s
Smart control for every system
Engineered for air conditioning and heat pump systems, this manifold delivers precision, flexibility, and smart connectivity. Its intuitive design ensures effortless operation - even when you’re wearing gloves.
App-style operation with clear measurement graphics
Operate via touchscreen, keypad or App
Trend curves of readings over a 30-minute period
Compatible with A2L and A3 refrigerants
testo Smart App
One app. Many devices. Total control.
Say goodbye to paperwork and scattered data. With the testo Smart App, all your refrigeration and heat pump measurements are stored in one place - boosting productivity and minimizing interruptions.
Flexible – works with all Bluetooth® enabled Testo instruments
Intuitive – guided measurement menus
Efficient – quick and easy documentation
Always current – regular updates included
Smart & free – free download, free to use
Cool kits with all the essentials – plus perfect add-ons
Everything You Need to Service Heat Pumps
testo 558s
Heat pump professional kit
Includes 3-way valve block, two testo 115i clamp thermometers, one testo 552i vacuum probe and the testo 560i refrigerant scale.
Testo Insider
What our customers say
It’s so intuitive – just like using a smartphone. That’s not something I’ve experienced with other manifolds. It has a great selection of refrigerants and a brilliant feature that shows system pressures as a clear graph. Truly a fantastic bit of kit.
Chloe Jennings
Delta T Refrigeration
Practical knowledge
Automatic Evacuation Made Easy
Learn how to remove air and moisture from refrigeration and heat pump systems. This checklist walks you through automatic evacuation with smart tools and proven steps.
Servicing heat pumps
A step-by-step checklist – from visual inspection to final documentation – to help you service heat pumps efficiently and professionally.
Heating technology
With Testo instruments, you’re fully equipped for all heating jobs - from flue gas analysis to precise heat pump adjustment.
Smart, reliable, and built for HVAC/R professionals.
testo 300 NEXT LEVEL
From complex to effortless.
The testo 300 NEXT LEVEL is your digital assistant for flue gas analysis helping you measure faster, more accurately and with greater comfort.
Parallel measurements – Capture up to four values simultaneously with wireless probes
Second screen function – View real-time data via the testo Smart App
Smart touch display – Rugged and glove-friendly for effortless operation
testo Smart App
One app. Many devices. Total control.
Say goodbye to paperwork and scattered data. With the testo Smart App, all your heating and heat pump measurements are stored in one place - boosting productivity and minimizing interruptions.
Flexible – works with all Bluetooth® enabled Testo instruments
Intuitive – guided measurement menus
Efficient – quick and easy documentation
Always current – regular updates included
Clever – free download, free to use
Our bestselling heating kits
testo 300 NEXT LEVEL Kit 1
This kit equips you for all essential measurement tasks on heating systems.
With O2 and CO sensor up to 4,000 ppm
Instrument case and practical accessories
Measure More. Save Time.
With testo Smart Probes you save valuable time on site through parallel measurements:
Record multiple spots for more detailed results
Measure temperature, pressure and flow simultaneously
Keep all results documented in a single report
All you need for efficient parallel measurements
With the testo Smart Probes HVAC kit, you can measure temperature and pressure simultaneously – saving time and simplifying your workflow.
testo 915 – thermometer with interchangeable probes
Temperature probes – air probe, immersion/penetration probe and surface probe
testo 510i – differential pressure measuring instrument
Handy case – practical transport and storage
Insights for heating experts
Efficient parallel measurements checklist
We guide you step by step through the intuitive process of parallel measurement with the testo 300 NEXT LEVEL
Optimize Your Heating System: Tips & Tricks
Everything you need to know to carry out measurement tasks on heating systems efficiently and safely
Master heat pumps. Stay connected.
Master heat pumps. Stay connected.
Not only for traditional systems – also for heat pumps, all the essential solutions are ready. Precision and connectivity go hand in hand: pressure, temperature, and refrigerant data are digitally linked for complete insight and effortless performance checks.
Heat pump starter kit
The testo 550s heat pump entry-level kit gives you everything you need for straightforward commissioning and servicing
Digital manifold testo 550s – with large graphic display and Bluetooth®
2-way valve block – for reliable measurements and servicing
2 x testo 115i – wireless clamp thermometers for flow and return temperatures
Rugged housing (IP54) – durable and practical on site
Addtional heat pump kits
testo 550s – Basic Kit
Digital manifold with 2-way valve block and Bluetooth®
Includes two clamp temperature probes with fixed cable
Testo Insider
Customer Voice
Testo is our perfect partner for all service assignments. As we place a very high value on quality, we only use the latest technology in measuring and testing equipment. Testo is our perfect partner for all service assignments in the field of heating & cooling solutions.
Melano Hellwig
Team Leader Field Support, Panasonic Heating
Ventilation and IAQ technology
Measure indoor climate with ease.
With the testo 400, testo 440, and a wide range of probes, you can measure faster, document more efficiently, and maintain full control over indoor environments - all in compliance with DIN EN 12599 standards.
testo 400
As easy as it gets
The testo 400 universal climate measuring instrument lets you measure air volume flows in ducts and at outlets with maximum speed, precision, and ease.
Interactive menus for guided measurements
Analysis software for creating professional reports
Expandable with a wide probe portfolio
Professional kits for every climate task
testo 400 flow kit with 16 mm vane probe
Ideal kit for climate professionals focusing on air volume flow measurement.
Includes 16 mm vane probe head, 100 mm vane probe head and humidity-temperature probe head all attachable to the supplied Bluetooth® handle.
Smart performance in a compact form
Compact vane anemometer testo 417
Easy, fast and precise measurement of flow, volume flow and temperature at air inlets and outlets
Efficient regulation of balanced residential ventilation and fast documentation with the testo Smart App
testo Smart App
One app. Many devices. Total control.
Say goodbye to paperwork and scattered data. With the testo Smart App, all your indoor climate measurements are stored in one place - boosting productivity and minimizing interruptions.
Flexible – works with all Bluetooth® enabled Testo instruments
Intuitive – guided measurement menus
Efficient – quick and easy documentation
Always current – regular updates included
Clever – free download, free to use
Professional know-how for precise results
Optimizing ventilation for health and comfort
Discover how precise balancing of ventilation systems helps prevent moisture damage and mould, while ensuring a comfortable and healthy indoor climate.
Efficient Measurement Across Multiple Locations
Learn how to save time and streamline your workflow by measuring climate parameters across multiple sites with the power of the testo Smart App.
Thermography for HVAC/R
Stop guessing. Start seeing.
Get clearer insights in your inspections with our smart thermal cameras. Quickly assess radiator flow, identify hot spots in compressors and electrical components, locate underfloor heating leaks, and reliably detect mould risks.
testo 860i
HVAC/R diagnostic beyond the naked eye
Get clarity transmitted right to your mobile device. The testo 860i is a compact thermal camera that automatically connects to the testo Smart App to deliver sharp thermal images and smart diagnosis.
High image resolution (256 x 192 pixels)
Delta T and Hot Spots immediately visible with automatic detection and calculation
Humidity mode for reliable detection of risk of mould
Seamless extension of your HVAC/R tools with easy operation and reporting in the testo Smart App
Testo Insider
Customer Voice
The testo 860i thermal camera has been a game changer for me in the refrigeration trade. It makes it easy to spot issues with motors or compressors before they fail, and I use it all the time to double-check valves are working properly. It’s also great for checking electrical panels and making sure there aren’t any hot spots. The testo 860i has become a vital tool in my daily work. It takes away the guesswork when diagnosing systems, letting me clearly see potential issues.
@harry_hvac_irl
Senior Service Engineer, BMC Eirco Refrigeration & HVAC
testo Smart App
Sharp images. Easy operation. Smart diagnostics.
Paired with the testo Smart App, the testo 860i becomes a seamless extension of your HVAC/R toolkit. Easy to use with real-time display on your phone, effortless documentation, and on-site report sharing.
With its HVAC/R tailored measuring programs, it´s designed for intuitive, reliable, and fast inspections:
Thermography: Quick spot checks with automatic hot- and cold-spot detection.
DeltaHeat: Automatic calculation of the temperature difference between flow and return on radiators.
Humidity Mode: Reliable detection of mould risk using the traffic-light principle.
testo 868(s)
Turn on. Point. See more.
If you want to view thermal images directly on your thermal camera while enjoying smart connectivity for easy data sharing and reporting, the testo 868(s) is the perfect choice.
High-Quality Thermal Resolution: 160 × 120 pixels enhanced to 320 x 240 with testo SuperResolution
Accurate Temperature Detection: Thermal sensitivity of < 0.08 °C
User-Friendly & Durable: Intuitive one-handed operation with a rugged, IP54-rated design
Thermography App: On-site data sharing and reporting
Here’s why every HVAC/R pro needs thermography
Radiator Performance
See temperature distribution
Detect uneven flow
Quickly spot blockages or air pockets
Electrical components
Spot abnormal heat patterns
Detect hotspots from loose connections, worn bearings or overload
Spot leaks
Enable quick, non-invasive leak detection
Prevent damage and energy loss
Motors and compressors
Identify overheating in motors and compressors
Detect wear or misalignment
Prevent failures and downtime
Level up your thermography game
Thermography already found its way into the heating sector some years ago and is now in widespread use. Learn how it can level up your inspections.