Feature: 1. Measurements on refrigeration systems and heat pumps can be done very quickly 2. Equipped with a large display screen for easy evaluation of measurement results 3. Concise menu guides you through measurements and automatically determines key system parameters such as target superheat, air tightness testing and vacuum 4. Wireless bluetooth connection: The bluetooth probe for temperature, pressure and humidity measurement will automatically connect to the refrigerant meter (the package does not include bluetooth probe) 5.testo Smart App The smart app creates a digital document on site with your favorite refrigerants. The system will automatically update the refrigerant storage to ensure that the instrument always has a wide range of applicability 6. Easy to operate, strong and durable housing, protection grade IP54, very compact and reliable Specification: Model: testo 550s digital refrigerant meter Measuring range: -50 ~ +150 C Measurement accuracy: 0.5 C Resolution: 0.1 C Probe connection: plug-in (NTC) Measuring range: -1 to 60 bar Measurement accuracy: 0.5 % of full scale Resolution: 0.01 bar Probe Connections: 3 x 7/16" UNF Overload Relative pressure (high pressure): 65 bar Dimensions: 210 x 121 x 60 mm (LxWxH) Operating temperature: -20 ~ +50 C Protection class: IP54 System requirements: requires iOS 11.0 or newer; requires Android 6.0 or newer; requires mobile end device with Bluetooth 4.0 Product colour: Black Automatic shutdown: 10 min* Battery type: 4 x type AA (not included) Battery life: 250 h with no illumination, no Bluetooth; 100 h with illumination and Bluetooth Data transfer: Bluetooth Radio range: 150 m Storage temperature: -20 ~ +60 C Refrigerants update via App: R11; FX80; I12A; R1150; R1270; R13B1; R14; R142B; R152A; R161; R170; R227; R236fa; R245fa; R401C; R406A; R407B; R407D; R41; Ra11A; R412A; R413A ; R417B; R417C; R422A; R426A; R508A; R508B; R600; RIS89; SP22 Refrigerant: R407H; R23; R290; R1234yf (display: T8 (testo 557), customer can update refrigerant by "EasyKool" software; R442A; R134a; R123; R452B; R438A; R421A; R453a; R401B; R1233zd; R410A ; R407A; R407C; R452A; R401A; R422C; R427A; R422B; R424A; R125; R414B; R404A; R408A; R448A; R422D; R12; R114; R421B; R449A; R409A; R420A; R444B; R32 ; R450A; R407F; R416A; R13; R437A; R1234ze; R454B; R402B; R22; R434A; R454C; R455A; R458A; R500; R502; R503; R507; R513A; Package Included: testo 550s digital refrigerant meter*1 Wired clamp probe (NTC)*2 Instrument case*1 Instruction Manual*1