Testo 552i App-Controlled Wireless Vacuum Probe with Bluetooth, Pirani Sensor, 0-20000 Micron Range, IP54 0564 2552

The Testo 552i stands apart from conventional vacuum gauges by eliminating cables and dedicated displays entirely. Instead, it pairs wirelessly with your smartphone or tablet via Bluetooth 4.2, turning the Testo Smart App into a live digital manifold for real-time evacuation monitoring. The integrated Pirani sensor delivers precise micron-level resolution from 0 to 20000 micron, making it ideal for HVAC/R commissioning, system evacuation, and leak testing. Its 7/16" UNF (SAE) connection threads directly onto standard service ports, while the rugged IP54 housing shrugs off dust and splashes in the field.

Highlights

• App-controlled wireless vacuum probe: no cables, no separate display
• Pirani sensor measures 0 to 20000 micron (0 to 26.66 mbar)
• High accuracy: ±(10 micron + 10% of reading) from 100 to 1000 micron
• Bluetooth 4.2 with up to 150 m line-of-sight range
• Long battery life: up to 360 hours on 3 AAA batteries
• Automatic connection to Testo Smart App and Testo digital manifolds
• IP54 protection against dust and water splashes

In daily use

Technicians can attach the 552i directly to a vacuum pump or system port, then monitor evacuation progress from a safe distance. The app displays real-time micron readings, logs data, and lets you generate reports on the spot. Because the probe connects automatically to compatible Testo digital manifolds, it integrates seamlessly into existing workflows without additional setup. The compact design fits easily into a tool bag, and the long battery life means fewer interruptions during extended evacuation jobs.

Full specifications

• Measurement principle: Pirani sensor
• Measurement range: 0 to 20000 micron (0 to 26.66 mbar)
• Accuracy: ±(10 micron + 10% of mv) from 100 to 1000 micron
• Resolution: 1 micron (0-1000 micron), 10 micron (1000-2000 micron), 100 micron (2000-5000 micron), 500 micron (5000-10000 micron), 1000 micron (10000-20000 micron)
• Overload protection: absolute 6 bar / 87 psi (relative 5 bar / 72 psi)
• Connection type: 7/16" UNF (SAE)
• Wireless connectivity: Bluetooth 4.2
• Bluetooth range: up to 150 m (line of sight)
• Power supply: 3 x AAA batteries
• Battery life: 360 hours
• Operating temperature: -10 to +50 °C (14 to 122 °F)
• Storage temperature: -20 to +60 °C (-4 to 140 °F)
• Protection class: IP54
• App compatibility: Testo Smart App (iOS 11.0+, Android 6.0+, Bluetooth 4.0+)
• Automatic connection: yes, to Testo Smart App and Testo digital manifolds
• Data logging: via Testo Smart App

Final note

The Testo 552i is a forward-thinking vacuum probe that replaces traditional wired gauges with app-based convenience, making it a smart choice for modern HVAC/R professionals who value mobility, accuracy, and seamless digital documentation.