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The testo 552i app-controlled wireless vacuum probe is a Bluetooth vacuum gauge used to measure vacuum in refrigeration and air conditioning systems and heat pumps through a single service port, without connecting hoses. It measures vacuum in the range of 0 … 20,000 microns; there is no refrigerant loss during measurement.
The probe has no display of its own: the value is read on the phone via the testo Smart App (iOS / Android) or on the display of the testo 550s and testo 557s digital manifolds to which it connects automatically via Bluetooth. Thanks to its integrated 45° angled connection, it attaches directly to the service port.
Judging that a vacuum pump "has pulled enough" by its running time is a common mistake in the field. Moisture left in the system reacts with the refrigerant and oil during operation and forms acid; it leads to icing in the capillary tube and expansion valve, and over time to compressor failure. Monitoring the vacuum level in microns lets you see how the value behaves after the pump is stopped:
| Measuring range | 0 … 20,000 micron (0 … 26.66 mbar) |
| Accuracy | ±10 micron + 10% of measured value (100 … 1,000 micron) |
| Resolution | 1 micron (0 … 1,000) · 10 micron (1,000 … 2,000) · 100 micron (2,000 … 5,000) |
| Overload | Absolute 6.0 bar / 87 psi (relative 5.0 bar / 72 psi) |
| Connection | 7/16 inch UNF, 45° angled |
| Interface / range | Bluetooth 4.2 / up to 150 m |
| Battery / battery life | 3 × AAA / 39 hours |
| Auto power off | 10 minutes (when not connected via Bluetooth) |
| Protection class | IP54 |
| Operating / storage temperature | −10 … +50 °C / −20 … +50 °C |
| Dimensions / weight | 150 × 32 × 31 mm / 142 g |
| Colour | Black / orange |
| Testo order code | 0564 2552 |
testo 552i wireless vacuum probe, batteries and test protocol.
The testo Smart App is free; a phone or tablet with iOS 13.0 or Android 8.0 and above and Bluetooth 4.2 support is required.
The testo 552 is a stand-alone digital vacuum gauge with its own display. The testo 552i is a wireless vacuum probe without a display; the value is read in the testo Smart App on the phone or on the display of a testo digital manifold.
It connects automatically via Bluetooth to the testo 550s and testo 557s digital manifolds. The testo 552i vacuum probe is also included in the testo 558s smart vacuum kit.
Yes. These instruments, also called "micron gauge" or "vacuum gauge" in the field, measure vacuum in microns; the testo 552i is the wireless, app-controlled model.
📄 Testo 552i datasheet (PDF, English)
testo 55x digital manifold series and working with wireless probes — Testo Türkiye.
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