testo 549i - High-pressure gauge operated via smartphone

The Testo 549i is a compact wireless high-pressure gauge designed for HVAC-R technicians working on air conditioning, refrigeration and heat pump systems. Operated through the Testo Smart App, it allows technicians to measure system pressure directly from a smartphone or tablet without needing traditional manifold hoses.

When used together with the Testo 115i wireless clamp thermometer, the Testo Smart App can automatically calculate evaporation and condensation temperatures, as well as key refrigeration values such as superheat and subcooling. With Bluetooth range up to 100 m, the 549i is ideal for fast, flexible servicing and troubleshooting on modern HVAC-R systems.

Key Features

• Wireless high-pressure gauge for HVAC-R service work
• Operated via the Testo Smart App
• Measures high-side and low-side refrigerant pressure
• Suitable for air conditioning, refrigeration and heat pump systems
• Low refrigerant loss because no hoses are required for direct measurement
• Calculates evaporation and condensation temperatures in the app
• Supports superheat and subcooling calculations when used with Testo temperature probes
• Bluetooth range up to 100 m
• Measurement data can be displayed as graphs or tables
• App-based documentation and report sharing
• Compact Smart Probe design for easy service use
• Commonly supplied in Testo Smart Probe AC & Refrigeration kits

Specifications

Kit Includes

• 1 × Testo 549i wireless high-pressure gauge
• Batteries
• Calibration protocol

Applications

• Refrigeration pressure measurement
• Air conditioning diagnostics
• Heat pump commissioning
• High-side and low-side pressure checks
• Superheat and subcooling calculation with Testo 115i
• Evaporation and condensation temperature calculation
• Split system installation and service checks
• Wireless HVAC-R service documentation

The Testo 549i — 0560 2549 02 gives technicians a compact, wireless pressure measurement solution for everyday HVAC-R service work. With app-based readings, Bluetooth connectivity and compatibility with Testo Smart Probes, it is a practical alternative to traditional hose-based pressure testing for fast diagnostics and commissioning.