The professional and compact testo 549i high-pressure gauge 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. The App also enables evaporation and condensation temperatures to be calculated automatically. Measurement of high and low pressure Low refrigerant loss – since no hoses are required for measurements Measurement data displayed in the form of a graph or table, and sent via testo Smart Probes App Problem-free application at measuring points that are a long distance apart thanks to Bluetooth® range up to 100 m