Testo 0560 1549 549i smartprobe bluetooth high pressure gauge testo 0560 1549 p the testo 549i high pressure measuring instrument is suitable for carrying out wireless installation servicing and troubleshooting on air conditioning and refrigeration systems it makes working on widely spaced pressure connections considerably easier thanks to wireless connection to a smartphone or tablet p p as no hoses are required for measurements little or no refrigerant is lost readings can be viewed