Testo 0560 2549 03 549i High-Pressure Gauge 2nd Generation 45 DegreeThe testo 549i Smart Probe is a hose-less, wire-less, pressure probe for measuring refrigerant charge in AC/Refrigeration systems. It is used for servicing, troubleshooting, and documenting the operation of residential or commercial AC/refrigeration systems. When two 549i are used in conjunction with two 115i pipe-clamp temperature probes it is easy to monitor superheat and sub-cooling in AC/refrigeration systems. Users can read the measurements using the testo Smart Probes App installed on their smart device. The testo 549i easily connects to standard Schrader valves without tools and without hoses, eliminating any refrigerant loss. The testo 549i works on smart devices with either Android or Apple operating systems at distances up to 350'.Testo 552i App-Controlled Wireless Vacuum Probe I for HVAC Systems – with Bluetoothtesto 552i – Accurate, app-controlled vacuum measurements The 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. testo 552i: Measuring range: 0 to 0.39 psi; 0 to 26.66 mbar; 0 to 20000 micron Accuracy: ±(10 micron + 10 % of mv) (100 to 1000 micron) Protection class: IP54 Resolution:1 micron (0 to 1000 micron) ; 10 micron (1000 to 2000 micron) ;100 micron (2000 to 5000 micron) Battery life: 39 hours Battery type: 3 x AAA micro batteries Connection: 7/16” UNF Measuring range: 0.5 sec Weight: 142 g Dimensions: 150 x 32 x 31 mm Operating temperature: -10 to +50 °C Storage temperature: -20 to +50 °C System requirements: requires iOS 11 or higher; requires Android 6 or higher; requires mobile end device with Bluetooth 4.0 Scope of delivery: ✓ 1 x testo 552i micron gauge ✓ Banderole, instruction manuals and calibration protocols ✓ 1 x Carton box packaging