testo 550s Set (includes 2x 115i and 1x 552i) – Remote and accurate measurements of pressure, vacuum and pipe temperature Installation and maintenance of air conditioning, refrigeration systems and heat pumps has never been more convenient thanks to the testo 550s vacuum kit. It is the ideal set of products for highly reliable and flexible measurement and documentation. Thanks to its smart Bluetooth integration, data can be stored and evaluated reliably and efficiently from afar, thus saving precious time and resources. Technical Data: testo 550s: Temperature measuring range: -58° to +302°F / - 50° to +150°C Temperature measurement accuracy: ±0.9 °F / ±0.5 °C Pressure measuring range: -15 to 870 psi / -1 to 60 bar Pressure measurement accuracy: ±0.5 % of full-scale value Pressure overload relay: 943 psi / 65 bar Vacuum measuring range: -15 to 0 psi / -1 to 0 bar Probe connection type: 2 x plug-in (NTC) testo 115i: Measuring range: -58° to 302 °F / -50 to +150 °C Accuracy: ±2.3 °F (-4 to 185 °F) Battery life: 150 hours Battery type: 3 x AAA Weight: 4.49 oz. / 127.4 g Dimensions: 7 x 4 x 1 in. / 183 x 90 x 30 mm 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: IP42 Resolution:1 micron (0 to 1000 micron) ; 10 micron (1000 to 2000 micron) ;100 micron (2000 to 5000 micron) Battery life: 50 hours Battery type: 2 x AA Measuring range: 0.5 sec Weight: 18 oz. / 500 g Dimensions: 6 x 4 x 2 in. / 160 x 110 x 50 mm 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 550s app operated manifold, including batteries ✓ 2 x testo 115i pipe clamp thermometer ✓ 1 x testo 552i micron gauge ✓ 1 x Protective case ✓ Banderole, instruction manuals and calibration protocols