Testo digital manifold gauge 550s with 2 wired clamp probes, Bluetooth & superheat/subcooling

The Testo 550s is a professional-grade digital manifold gauge kit that measures pressure, temperature, superheat and subcooling with Bluetooth data transfer for fast, accurate HVAC and refrigeration diagnostics.

Compact and rugged, the Testo 550s brings precise electronic measurement and wireless reporting to service, installation and troubleshooting on air conditioners, refrigeration circuits and heat pumps. The unit combines wide-range pressure and temperature sensors with industry-standard calculations and app connectivity so techs can capture readings, compute performance values and store or share reports from the field.

How accurate and wide-ranging are the Testo 550s measurements?

The 550s covers an extensive temperature and pressure span to handle common refrigerants and operational extremes. Pressure readings go from vacuum to high side service ranges, while temperature probes read well below freezing to high service temperatures—all with tight tolerances designed for professional use.

• Temperature range: -58° to 302°F (-50 to 150°C) with ±0.9°F (±0.5°C) accuracy
• Pressure range: -15 to 870 psi (-1 to 60 bar) with ±0.5% full-scale accuracy
• IP54-rated housing for dust and splash resistance on job sites
• Compact footprint: 210 × 121 × 60 mm for easy carry and storage

What connectivity and reporting features speed up field workflows?

The Testo Smart App pairs with the 550s via Bluetooth to display live measurements, compute superheat and subcooling automatically, and generate digitally signed reports. Wireless probe options reduce cable clutter while the app archives readings and lets technicians email results directly from the site.

• Bluetooth data streaming to smartphone or tablet
• Automatic superheat/subcooling calculations in-app
• On-site report generation and export for customer documentation
• Wireless temperature and vacuum probe compatibility for cleaner setups

Which refrigerants and systems can the testo 550s work with?

The 550s supports a broad selection of common refrigerants and modern lower-flammability A2L refrigerants used in current HVACR installations. Its calculation library and sensor ranges allow use on split systems, rooftop units, commercial refrigeration, and heat pumps without swapping instruments mid-job.

• Preloaded refrigerant database including A2L compatibility
• Suitable for AC, refrigeration circuits and heat pump systems
• Superheat and subcooling workflows tailored to service tasks
• Accessory options (probes, vacuum module, transport case) for specialized jobs

Who is this for? The Testo 550s is aimed at HVACR technicians, service managers and refrigeration specialists who need a dependable, fast-reporting toolset for diagnostics and commissioning. If you require professional-level accuracy, app-based documentation and a robust instrument that stands up to field conditions, the 550s offers the measurement range, connectivity and accessory flexibility to streamline routine service, preventive maintenance and complex troubleshooting.