<h2><span style="font-size:13px">The professional and compact testo&nbsp;549i high-pressure gauge can be controlled via the testo&nbsp;Smart App using your smartphone or tablet, and is ideal for carrying out servicing and troubleshooting on air conditioning and refrigeration systems. The App also enables evaporation and condensation temperatures to be calculated automatically.</span></h2>

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For refrigeration engineers: Compact kit containing testo&nbsp;549i high-pressure gauge and testo&nbsp;115i clamp thermometer (two of each). Used in conjunction with your smartphone/tablet, the kit is ideal for servicing, troubleshooting and installing air conditioning and refrigeration systems. The testo&nbsp;Smart App makes your work easier and more efficient: over 90 stored refrigerants, automatic calculation of superheating/subcooling, emailing of measurement data reports as PDF or Excel files.

For refrigeration engineers: The kit contains two testo&nbsp;549i high-pressure gauges, two testo&nbsp;605i thermohygrometers and two testo&nbsp;115i clamp thermometers. Used in conjunction with your smartphone/tablet, the kit is ideal for servicing, troubleshooting and installing air conditioning and refrigeration systems. The testo&nbsp;Smart App makes your work easier and more efficient: over 90 stored refrigerants, automatic calculation of superheating/subcooling, target superheat and cooling/heating power, emailing of measurement data reports as PDF or Excel files.

Ultimate kit for all-round engineers in the field of heating, air conditioning, refrigeration and ventilation: The kit contains all the testo Smart Probes and is ideal for carrying out functional checks or for plant maintenance, in conjunction with your smartphone/tablet. The testo Smart App enables you to work more easily and efficiently: Automatically calculate numerous parameters such as superheating/subcooling, target superheat, cooling/heating power or differential temperature. Measurement data reports can be emailed directly as a PDF or Excel file.

Keep your refrigerant hoses performing at their best with the genuine white hose seal (0190 5500) from Testo. Designed specifically for the hoses supplied with Testo manifolds, this O-ring ensures a secure, leak-tight connection every time helping technicians maintain accurate pressure readings and reliable system diagnostics in the field.

White Hose Seal O-Ring for Testo Manifold Hoses

White Hose Seal O-Ring for Testo Manifold Hoses