Testo 552 Digital Vacuum Gauge with Bluetooth 
If you work in HVAC or refrigeration, you already know how important it is to confirm that a system is fully evacuated before charging refrigerant. The Testo 552 Digital Vacuum Micron Gauge with Bluetooth makes that process simple, trustworthy, and efficient. It delivers deep-vacuum micron measurements with solid accuracy, so you know exactly when moisture and air have been removed from the system.
One of the best parts of this tool is its Bluetooth connectivity, which allows you to connect the gauge to your phone and track live vacuum readings through the Testo Smart App. This means you don’t have to stand beside the unit the entire time; you can multitask, step away, or even work in a less comfortable location while still monitoring the results on your screen.
The overall build of the Testo 552 is sturdy and job-ready. It’s compact, easy to carry, and engineered to handle real-world working environments. The housing is water-resistant and dust-resistant, making it reliable for daily professional use whether you're doing AC installation, refrigeration maintenance, or routine vacuum testing.
Key Features
Deep vacuum micron measurement for accurate system evacuation
Bluetooth compatibility for wireless monitoring
Testo Smart App support for live tracking and data recording
Bright digital display visible even in dark areas
Strong battery life that keeps up with long field jobs
Rugged, dust-resistant and water-resistant body
Built-in data logging for documentation and reports
Lightweight and compact — perfect for technicians who travel with tools
How to Use the Testo 552 (Simple & Practical Steps)
Switch on the Testo 552 device.
Enable Bluetooth on your smartphone.
Launch the Testo Smart App.
Choose the Testo 552 from the connected devices list.
View real-time vacuum readings directly on your phone screen.