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Temperature Measuring range: -50 to +150 °C
Accuracy: ±0.5 °C
Resolution: 0.1 °C
Probe connection: 2 x plug-in (NTC)
Pressure measurement
Measuring range: -1 to 60 bar
Accuracy: ±0.5 % fs
Resolution: 0.01 bar
Probe connection: 3 x 7/16" – UNF
Overload rel. (high pressure): 65 bar
General technical data
Weight: 826 g
Dimensions: 210 x 121 x 60 mm (LxWxH)
Operating temperature: -20 to +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
Auto-off: 10 min*
Battery life: 250 h with no illumination, no Bluetooth<sup>®</sup>; 100 h with illumination and Bluetooth<sup>®</sup>
Battery type: 4 x type AA batteries
Data transfer: Bluetooth®
Radio range: 150 m
Refrigerants in instrument: R114; R12; R123; R1233zd; R1234yf; R1234ze; R124; R125; R13; R134a; R22; R23; R290; R32; R401A; R401B; R402A; R402B; R404A; R407A; R407C; R407F; R407H; R408A; R409A; R410A; R414B; R416A; R420A; R421A; R421B; R422B; R422C; R422D; R424A; R427A; R434A; R437A; R438A; R442A; R444B; R448A; R449A; R450A; R452A; R452B; R453a; R454A; R454B; R454C; R455A; R458A; R500; R502; R503; R507; R513A; R600a; R718 (H₂O); R744 (CO₂)
Refrigerants update via App: R11; FX80; I12A; R1150; R1270; R13B1; R14; R142B; R152A; R161; R170; R227; R236fa; R245fa; R401C; R406A; R407B; R407D; R41; R411A; R412A; R413A; R417A; R417B; R417C; R422A; R426A; R508A; R508B; R600; RIS89; SP22
Refrigerant: A2L / A3 compatibel
Storage temperature: -20 to +60 °C
Delivery Scope
testo 550s digital 2-way manifold including batteries (4 x AA) and calibration protocol
2 x testo 115i wireless Bluetooth clamp thermometers
Transport case
testo Smart App (free download)
Instruction manuals
