Products, Smart Probes, Testo

Smart High Pressure Measuring Instrument – testo 549i


Testo 549i high-pressure, the smart compact high pressure measuring instrument can be controlled via the testo Smart Probes App using your smartphone or tablet, and is ideal for carrying out servicing and troubleshooting on air conditioning and refrigeration systems.

Testo offers you greater mobility when measuring: used in conjunction with your smartphone or tablet, the handy testo 549i high-pressure measuring instrument is suitable for carrying out wireless servicing and troubleshooting on air conditioning and refrigeration systems, as well as for installing them. The measuring instrument can be set up quickly and easily, directly at the pressure connection. The testo 549i makes working on widely spaced pressure connections considerably easier thanks to wireless connection to a smartphone or tablet. Also practical: no hoses are required for measurements, meaning that no or only very little refrigerant is lost. When used in conjunction with the testo 115i clamp thermometer, individual refrigeration system parameters can also be calculated.

More measuring convenience thanks to the App
Readings can be viewed conveniently on your terminal device via the testo Smart Probes App. The App also enables evaporation and condensation temperatures to be calculated automatically. All measurement data is displayed either as a chart or in table form. The measurement data log can be emailed directly as a PDF or Excel file.

System requirements:
iOS 8.3 or later
Android 4.3 or later
Bluetooth 4.0


• Compact professional measuring instrument from the Testo Smart Probes series, for use with smartphones/tablets
• Measurement of high and low pressure
• Fast and easy installation at a pressure connection
• Low refrigerant loss thanks to hoseless application
• Measurement data analyzed and sent via testo Smart Probes App
• Space-saving and easy to transport

Delivery Scope

testo 549i high-pressure measuring instrument with smartphone operation, including batteries and calibration protocol.


Download Datasheet Instruction manual

Application Image

Technical Details

Pressure measurement
Measuring range -1 to +60 bar
Accuracy ±0.5 % of fsv
Resolution 0.01 bar
Probe connection 7 / 16 ” – UNF
Overload rel. (high pressure) +65 bar
General technical data
Weight 156.6 g
Dimensions 125 x 32 x 31 mm
Operating temperature -20 to +50 °C
Product-/housing material Plastic
System requirements requires iOS 8.3 or newer; requires Android 4.3 or newer;
requires mobile end device with Bluetooth 4.0
Product colour black/orange
Battery type 3 AAA micro batteries
Battery life 150 h
Pressure media CFC, HFC, HCFC, N, H₂O, CO₂
Storage temperature -20 to +60 °C