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testo 552i Wireless Digital Vacuum Probe - Vacuum Gauge for HVAC Systems with IP54 Protection – 45° Service-Port Design - HVAC Tool for AC/R System Evacuation with Bluetooth and App

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Availability: In Stock.
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Arrives Friday, May 1
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Features

  • Accurate: The testo 552i vacuum gauge delivers deep-vacuum measurements down to single-digit resolution with an accuracy of 10 micron + 10% of mv (100-1000 micron). This gives you confidence that evacuation targets are reliably reached and verified
  • Easy-to-use: The micron gauge features an integrated 45 angle for quick, stress-free installation at any service port, while the robust IP54 housing ensures dependable operation even in demanding HVAC environments
  • Clever: For wireless vacuum measurement, the testo 552i vacuum gauge automatically connects to digital manifolds and operates via a single service port. Saving time, reducing setup complexity, and preventing refrigerant loss
  • Efficient: The hvac tool enables fast vacuum assessment and displays live measurement data directly on the digital manifold and in the testo Smart App, so you can make informed decisions without interrupting your workflow
  • Smart App: Use the Smart App to clearly document results on your smartphone or tablet, control service and maintenance tasks remotely, and send reports directly from the job site - saving time on documentation and follow-up

Description

testo 552i vacuum probe – Accurate, app-controlled vacuum measurementsThe 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.Technical data testo 552i:Measuring range: 0 to 0.39 psi; 0 to 26.66 mbar; 0 to 20000 micronAccuracy: ±(10 micron + 10 % of mv) (100 to 1000 micron)Protection class: IP54Resolution:1 micron (0 to 1000 micron) ; 10 micron (1000 to 2000 micron) ;100 micron (2000 to 5000 micron)Battery life: 39 hoursBattery type: 3 x AAA micro batteriesConnection: 7/16” UNFMeasuring range: 0.5 secWeight: 142 gDimensions: 150 x 32 x 31 mmOperating temperature: -10 to +50 °CStorage temperature: -20 to +50 °CSystem requirements: requires iOS 11 or higher; requires Android 6 or higher; requires mobile end device with Bluetooth 4.0Scope of delivery:1 x testo 552i vacuum gauge, banderole, instruction manuals and calibration protocols, 1 x Carton box packaging

Product Dimensions: ‎5.9 x 1.3 x 1.2 inches


Item Weight: ‎2.82 ounces


Manufacturer: ‎Testo SE & Co. KGaA


Item model number: ‎552i


Batteries: ‎3 AAA batteries required. (included)


Date First Available: ‎January 25, 2021


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, May 1

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

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Top Amazon Reviews


  • Good value. Keep it clean.
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

  • Testo - A complete HVAC testing system
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

  • 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

  • Great add to my HVAC toolbox.
Just used this vacuum gauge with my Testo app. It made my life so much easier. I was able to connect flawlessly to the app and Moni Yi for the evacuation of the minisplit system. Nice to be able to triple evacuate and save the whole process. Very easy to use and well worth the cost. Nothing like doing things right and recording the entire process. ... show more
Reviewed in the United States on November 26, 2025 by Jeff Zirkle

  • 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

  • Wireless is very useful
put this on a refrigeration recovery tank while evacuating it. I was able to drift around over about 40 feet or so and occasionally look at my iPhone to see the evac was going. Very useful. Was easy to use and to get going. OTOH, the app menu is not totally intuitive so it took me a while to get going at first. After that was easy to use. ... show more
Reviewed in the United States on November 14, 2024 by surfsidebill

  • Compact and works great.
The media could not be loaded. I been using this product for a few days now and it’s worked like a champ rain or shine. I love it and it’s easy to use. Would be helpful if it came with some adapters such as a 90 or a 1/4” to 5/16” mini split adapter. Most mini split adapters you buy don’t have the stem in them to press the center pin that presses the stem down to open the service valve. I had to specifically buy one for using this tool on mini splits and that’s all I deal with. All around good product though. ... show more
Reviewed in the United States on March 23, 2024 by Juice6781

  • Buen producto
Muy bueno. Excelente producto
Reviewed in the United States on August 10, 2025 by Samir C.

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