Testo 550i Smart Refrigerant Manifold Gauge Set (0564 2550)

HVAC technicians can monitor system pressures and temperatures wirelessly with the Testo 550i, a Bluetooth-enabled manifold gauge set for refrigeration and air conditioning service. The instrument pairs with the Testo Smart App on a smartphone or tablet, turning the mobile device into a live display and control panel.

Key specifications

• Pressure measurement range: -1 to 60 bar
• Pressure accuracy: ±0.5 % of full-scale value
• Overload pressure: 65 bar
• Temperature measurement range: -50 to +150 °C
• Temperature accuracy: ±0.5 °C (0 to +50 °C), ±1 °C (remaining range)
• Supported refrigerants: 90 common refrigerants via Testo Smart App
• Connectivity: Bluetooth 5.0 LE, range up to 150 m in free field
• Power supply: 3 x AAA batteries
• Battery life: up to 150 h without Bluetooth, 80 h with Bluetooth
• Protection class: IP54
• Pressure connections: 2 x 7/16" UNF
• Temperature probe connection: Testo Smart Probe connection
• Display: no integrated display (app-controlled)
• Calculations: automatic superheating/subcooling calculation

Why choose it

The 550i eliminates the need for a dedicated handheld display, reducing clutter and cost. Its long Bluetooth range allows technicians to monitor readings from a safe distance while the system operates. Automatic superheat and subcooling calculations streamline diagnostics and save time on the job.

Ideal use cases

• Commissioning and servicing split air conditioning systems
• Refrigeration system troubleshooting and leak detection
• Heat pump performance verification
• Preventive maintenance on commercial refrigeration units

Good to know

The manifold body is rated IP54 for protection against dust and water splashes, suitable for field use. The Testo Smart App provides refrigerant updates and data logging capabilities, enabling documentation and reporting from the mobile device.