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Testo

Testo 552i App-Controlled Wireless Vacuum Probe I for HVAC Systems – with Bluetooth

  • Based on 385 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Sep 24
Order within 3 hours and 49 minutes
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Features

  • Accurate: The testo 552i achieves precise deep vacuum measurements down to single digit resolutions and provides notifications when the evacuation target is met
  • Easy-to-use: The device is equipped with a built-in 45 angle for convenient installation and rugged IP 54 certified housing, which makes it extraordinarily compact and reliable
  • Clever: For the purposes of wireless vacuum measurement, the testo 552i automatically connects to digital manifolds and can be used via just one service port and no loss of refrigerant
  • Efficient: The gauge identifies vacuum in a rapid and easy manner and can display data on the digital manifold screen and in the testo Smart App in real time
  • Smart App: Take advantage of clearly visualized documentation from a smartphone or tablet. Remotely operate service and maintenance tasks and send results directly from the job site

Description

testo 552i – Accurate, app-controlled vacuum measurements The testo 552i Micron Gauge measures vacuum via just one service port and with no loss of refrigerant. Its handy, robust and clever design support HVAC technicians with numerous intelligent features like the graphic display of measurement data in the testo Smart App or on the manifold’s display. Its smart Bluetooth integration allows for data to be stored and evaluated reliably and efficiently, thus saving precious time and resources. testo 552i: Measuring range: 0 to 0.39 psi; 0 to 26.66 mbar; 0 to 20000 micron Accuracy: ±(10 micron + 10 % of mv) (100 to 1000 micron) Protection class: IP54 Resolution:1 micron (0 to 1000 micron) ; 10 micron (1000 to 2000 micron) ;100 micron (2000 to 5000 micron) Battery life: 39 hours Battery type: 3 x AAA micro batteries Connection: 7/16” UNF Measuring range: 0.5 sec Weight: 142 g Dimensions: 150 x 32 x 31 mm Operating temperature: -10 to +50 °C Storage temperature: -20 to +50 °C System requirements: requires iOS 11 or higher; requires Android 6 or higher; requires mobile end device with Bluetooth 4.0 Scope of delivery: ✓ 1 x testo 552i micron gauge ✓ Banderole, instruction manuals and calibration protocols ✓ 1 x Carton box packaging

Product Dimensions ‏ : ‎ 5.9 x 1.3 x 1.2 inches; 2.82 ounces


Item model number ‏ : ‎ 552i


Batteries ‏ : ‎ 3 AAA batteries required. (included)


Date First Available ‏ : ‎ January 25, 2021


Manufacturer ‏ : ‎ Testo SE & Co. KGaA


Country of Origin ‏ : ‎ China


Best Sellers Rank: #18,575 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #68 in Test Probes & Leads


#68 in Test Probes & Leads:


Customer Reviews: 4.4 4.4 out of 5 stars 385 ratings


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Sep 24

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Very accurate
It’s worth the money for any advance technician
Reviewed in the United States on May 29, 2025 by G Swagger
    • Good value. Keep it clean.
Review Image by TSI TSI
Review Image by TSI TSI
So overall this is a good unit. I was slightly hesitant to buy a gauge that was 100% Bluetooth with no built-in screen. So far that hasn't been an issue and I do like being able to monitor it from inside the building or my truck. I believe the gauge is accurate and effective. I did originally have one major issue while learning how to use it. You must not get any refrigerant or nylog inside the probe. Apparently I got some nylog inside the fitting and it gave some bizarre readings. Look at the screenshots. I cleaned the unit with 99% alcohol I connected it directly to the vacuum pump and cleaned it out. Afterwards it was good and reliable. One big note! Do not apply excessive pressure to this probe! 300 PSI will destroy the gauge. I usually apply 10 PSI of pressure to the system before disconnecting the vacuum gauge to prevent contamination. Once it's disconnected I then charge the system to the maximum. ... show more
Reviewed in the United States on February 9, 2025 by TSI TSI
    • Testo - A complete HVAC testing system
Review Image by Chris Chris
Review Image by Chris Chris
Review Image by Chris Chris
The Testo High Pressure Gauge and Vacuum Gauge are vital tools in an HVAC kit. I recently installed a mini-split that required you to evac the linesets before releasing the refrigerant. I had decided on the Testo platform and already had their Digital Manifold, as well as their wireless probes. I decided to get their vacuum probe to add into the ecosystem. These connect very easily to the system, though I do recommend using them alongside with a core removal tool so you can easily isolate and disconnect them. Actually, the setup I used was: HVAC Port to Core Removal Tool. Once you remove the core, I connected that online to the Vacuum Pump. On the access port on the core removal tool, I had another core depressor (not remover) and then connected the vacuum gauge to the core depressor. This way, You can evac the system to the vacuum pump, and shut off to isolate the system to an evac standing test. I pumped the system down to 200-300 microns, and let it stand for 15-20 minutes. If the system doesn't rise past 500 microns within 10 minutes, its considered a 'leak-free' system, and ready to release refrigerant. At this time, I closed off the core depressor valve, so that everything was 'off' and the released the refrigerant. This is recommended so that refrigerant doesnt get into the vacuum gauge. Though I'm sure it would be fine, I wanted to take the extra precaution. I'm very happy with the testo tools, and that you can save all the data to the App for future review. Since these don't need to be connected with hoses, if you dont want to, you are also potentially losing less refrigerant when using them (talking about the high side pressure gauges, not the vacuum gauge). ... show more
Reviewed in the United States on October 14, 2023 by Chris Chris
    • It's PERFECT. A DIY mini-split installers best find.
This German designed Testo vacuum probe is amazing and at half the cost of the ones with a digital LCD screen, this uses your iPhone or android as the readout. It works well for mini split vacuum monitoring, select "evacuation" from the long list of devices that app supports. And fire it up. Piece of cake. IMPORTANT.... Watch the triple evacuation video on Youtube from HVAC Tips guy ... I used his simple setup with two Appion Core removal tools. I did lose an hour wondering if the thing was working then I found and removed a "3rd" schrader valve, one was in the 5/8 Appion core removal tool, one in the 1/4" Appion core removal tool, in addition to the schrader inside the minisplit port. Once all three were gone, the vacuum sucked down fast and this gauge worked amazing. Was wondering if I should have bought CPS or another larger unit but paired with my iPhone over bluetooth it works great. VERY HAPPY with this gauge and price, it made the vacuum part of the DIY install go smooth. BTW, if you're wondering what a schrader valve is, it's the same little screw in tiny valve that holds air in your tires. It works one way. No mystery to that thing. Those Appion core removal tools worked great. ... show more
Reviewed in the United States on November 16, 2023 by Del Aney
    • Excelente producto
Excelente
Reviewed in the United States on March 14, 2025 by Romer
    • Dose the job, MOSTLY
Seams durable & work well, but after 50' it's hit or miss & you must be line of sight.
Reviewed in the United States on May 17, 2025 by chris
    • Wasted so much time because of this leaky gauge!
Leaks during decay testing following an evacuation. Drive me crazy as this was my first AC install and I couldn’t get a steady vacuum. It would also cycle up and down which didn’t make sense. Saw this on two different systems. Sucks because the testo Bluetooth sensors with the 550i are great for how they link together to the phone app but this gauge is garbage! ... show more
Reviewed in the United States on January 10, 2025 by StangCBR
    • Love these Bluetooth devices
Love this line of devices have been using the ac probes and this is just an addition to what I have. I have already used it and connect fast and simple to get it set up out of the box.
Reviewed in the United States on January 19, 2025 by Keith

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