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Compact wireless vacuum probe with angled 7/16 UNF fitting, IP54 housing, Bluetooth 4.0 connectivity

Testo

Testo 552i Wireless Vacuum Probe for HVAC with Bluetooth

SKU CH-3606-911HA

App-controlled wireless vacuum probe measures down to single-digit microns and alerts when evacuation target is reached via Bluetooth 4.0

  • Product typeApp-controlled wireless vacuum probe
  • Precise deep-vacuum readings down to 1 micron resolution
  • Wireless Bluetooth 4.0 link to Smart App for live data
  • IP54 rugged housing with built-in 45° angle for tight spaces
  • Single 7/16 UNF port measures vacuum without refrigerant loss
  • 39-hour battery life from three AAA cells

Wireless Vacuum Probe for HVAC

The Testo 552i is an app-controlled wireless vacuum probe built for HVAC technicians who need accurate deep-vacuum readings on refrigeration and air-conditioning systems. It measures from 0 to 20000 micron with 1 micron resolution up to 1000 micron and delivers ±(10 micron + 10 % of mv) accuracy between 100 and 1000 micron. Bluetooth 4.0 streams live data to the Testo Smart App or a compatible digital manifold display.

Compatibility Check Before Ordering

Your mobile device must run iOS 11 or higher or Android 6 or higher and support Bluetooth 4.0 to use the Smart App. The probe connects through a 7/16 UNF service port so verify that the system you are evacuating presents this fitting. Operating temperature spans -10 to +50 °C; ensure the job-site conditions stay within this range. Three AAA micro batteries are required and are not always included in the box.

Thermals Noise and Power Draw

The IP54-rated housing protects the electronics from dust and splashes during normal service work. Battery life reaches 39 hours of continuous operation before the three AAA cells need replacement. The compact 150 x 32 x 31 mm body weighs 142 g and has a built-in 45° angle for convenient installation without adding strain to the service port. No fan or active cooling is present so the probe runs silently.

How it compares

Measured against everything we stock in Meters, Testers & Measuring Tools, at today’s prices. Recalculated every night.

Price $113.99
Pricier than about 66% of the 3,030 comparable items (median $54.99).

Specifications

Product
Product typeApp-controlled wireless vacuum probe

Questions about this item

What comes in the box and do I need to buy batteries separately?

The package includes the 552i micron gauge, a protective banderole and instruction manuals; three AAA micro batteries are required and are not included.

Which measurement range should I rely on for deep evacuation work?

The probe reads from 0 to 20000 micron with 1 micron resolution up to 1000 micron, then 10 micron steps to 2000 micron and 100 micron steps to 5000 micron.

How accurate is the 100 to 1000 micron reading when the probe is on a live system?

Accuracy in that band is ±(10 micron + 10 % of measured value) at operating temperatures between -10 and +50 °C.

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