The Testo 550i is a compact 2-way app-controlled digital manifold designed for professional HVAC-R technicians working on refrigeration systems, air conditioning systems and heat pumps. Built without a traditional screen, the 550i is controlled directly through the Testo Smart App, giving technicians a clear digital workflow from measurement through to documentation.
With Bluetooth connectivity, a rugged IP54-rated housing and a compact valve block with sturdy hook, the testo 550i is ideal for service work in tight or difficult-to-access locations. It measures high and low side pressure, automatically calculates evaporation and condensation temperatures, and supports superheat/subcooling calculations when used with compatible Testo wireless temperature probes. Testo lists the 550i as compatible with a broad refrigerant database including R32, R410A, R134a, R290, R600a, R744 and many other refrigerants.
Key Features
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Compact 2-way digital manifold with Bluetooth
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Fully app-controlled through the Testo Smart App
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Suitable for refrigeration, air conditioning and heat pump systems
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Measures high and low side system pressure
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Calculates evaporation and condensation temperatures
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Supports superheat and subcooling when paired with wireless temperature probes
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Compatible with wireless Testo Smart Probes for temperature, humidity and vacuum
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Rugged IP54-rated housing for field use
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Sturdy hook for easy hanging during service work
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Broad refrigerant database with regular app updates
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Ideal for tight plant areas, split systems and service vans
Specifications
| Item | Specification |
|---|
| Brand | Testo |
| Model | testo 550i |
| Product Number | 0564 2550 |
| Product Type | App-Controlled Digital Manifold |
| Manifold Type | 2-Way Digital Valve Block |
| Display | No onboard display — app-controlled |
| Connectivity | Bluetooth / Testo Smart App |
| Refrigerant Database | Wide refrigerant database via app |
| Refrigerant Examples | R32, R410A, R134a, R1234yf, R290, R600a, R744 and more |
| Protection Rating | IP54 |
| Compatible Probes | Testo Smart Probes for temperature, humidity and vacuum |
| App Requirements | Smartphone or tablet with compatible iOS / Android version |
| Power Supply | 3 × AAA batteries |
| Application | Refrigeration, air conditioning and heat pump servicing |
Kit Includes
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1 × Testo 550i app-controlled 2-way digital manifold
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3 × AAA batteries
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Calibration protocol
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Instruction manual, depending on regional package
Applications
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Refrigeration system servicing
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Air conditioning commissioning
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Heat pump diagnostics
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High and low pressure measurement
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Evaporation and condensation temperature calculation
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Superheat and subcooling measurement with compatible probes
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Vacuum monitoring with compatible Testo wireless vacuum probe
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Digital service documentation through the Testo Smart App
The Testo 550i — 0564 2550 gives HVAC-R technicians a compact, app-based digital manifold for modern service work. With wireless probe compatibility, smart documentation and a rugged IP54 body, it is a practical option for technicians who want a lightweight digital manifold without carrying a larger screen-based unit.
