Testo 557 Digital Refrigeration Gauge with Vacuum Probe – 0563 1557

The Testo 557 is a Bluetooth-enabled digital 4-way manifold built for commissioning, service and maintenance on refrigeration systems and heat pumps. It combines pressure and temperature measurement, real-time superheat and subcooling, and precise external vacuum measurement in one field-ready kit.

Compare it with our full refrigerant gauges range, browse the wider Testo collection, or contact the team via our support page if you need help choosing the right digital manifold for your workflow.

Quick summary

The Testo 557 suits HVAC-R technicians who want faster commissioning, evacuation and service diagnostics without juggling separate gauges, temperature probes and a standalone micron gauge.

Best for

• Refrigeration and air conditioning service technicians
• Heat pump commissioning and maintenance
• Techs who want app-based reporting and refrigerant updates
• Workflows where accurate vacuum measurement matters during evacuation

Why tradies choose the Testo 557

• 4-way digital manifold: built for faster, cleaner service and charging workflows.
• External Pirani vacuum probe: gives more precise vacuum measurement during evacuation than relying on a rough gauge estimate.
• Real-time superheat and subcooling: calculated automatically using the included clamp probes.
• Bluetooth app connection: monitor readings, save results and generate documentation on site.
• Heat pump mode: helps reduce hose swapping during reversible-system work.
• Refrigerant library with updates via app: keeps the instrument more useful as refrigerant choices evolve.

Key specs

Compatibility and setup notes

The Testo 557 is designed for refrigeration systems and heat pumps where accurate pressure, temperature and evacuation data are important. It is a strong fit for technicians who want one instrument for commissioning, service and maintenance rather than switching between separate gauges and vacuum tools.

For better evacuation performance, pair it with a suitable vacuum pump and quality refrigerant hoses. If you also charge by weight regularly, a dedicated refrigerant scale is still recommended.

What’s included

• Testo 557 digital manifold
• 2 x clamp temperature probes
• External vacuum probe
• Batteries
• Carry case
• Calibration certificate

What you may also need

• Refrigerant hoses – for charging, testing and evacuation setups.
• Vacuum pumps – to build a faster, more reliable evacuation workflow.
• Refrigerant scales – for accurate charging and recovery by weight.
• Testo 557 compliance and logging guide – practical AU context for reporting and documentation workflows.

Official references

• Testo 557 official product page
• Testo 557 official data sheet
• ARCtick refrigerant handling licence information
• ACCC consumer guarantees guidance

Frequently asked questions

Is the Testo 557 suitable for heat pumps as well as refrigeration systems?

Yes. Testo positions the 557 for commissioning and maintenance on refrigeration systems and heat pumps, and its automatic heat pump mode is useful on reversible systems.

Does the Testo 557 include a vacuum probe?

Yes. This set includes an external vacuum probe for precise vacuum measurement during evacuation.

Can I generate reports from the Testo 557?

Yes. The Bluetooth connection to the Testo Smart App allows monitoring, saving and documenting measurements on a smartphone or tablet.

Does this replace a refrigerant scale?

No. The 557 is excellent for pressure, temperature, vacuum and calculated values like superheat and subcooling, but charging by weight still calls for a dedicated refrigerant scale.

How many refrigerants are stored in the instrument?

The instrument stores 60 common refrigerants, and updates can be made via the app.

Is this a DIY tool?

It is a professional HVAC-R instrument. Work that involves refrigerant handling or service on RAC equipment in Australia requires the appropriate licence and should be carried out by competent, properly authorised persons.