Testo 550i Smart Kit - App-Controlled Digital Manifold with Wireless Clamp Temperature Probes (NTC)

Brand: Testo

The kit for app-controlled, wireless measurements and digital documentation on your smartphone.

You will get the Testo 550i app-controlled digital manifold with Bluetooth, 2-way valve block and sturdy hook, two Testo 115i wireless clamp thermometers (Bluetooth, NTC) and a robust transport case.

For other wireless measurements, the optional Testo Smart Probes for temperature, humidity and vacuum are the perfect addition.

You’ll be ideally equipped to carry out your measuring tasks on refrigeration and air conditioning systems and also heat pumps.
  • All activities, from measurement through to documentation, using the App on your Smartphone
  • The smallest digital manifold on the market
  • Maximum reliability and excellent flexibility: extremely robust housing with protection class IP54, optionally expandable with the wireless Testo Smart Probes for temperature, humidity and vacuum
  • In the kit: App-controlled Testo 550i digital manifold with Bluetooth®



Delivery Scope

  • Testo 550i digital 2-Way manifold including batteries (3 x AAA) and calibration protocol
  • 2 x Testo 115i wireless Bluetooth clamp thermometers
  • Transport case
  • Testo Smart App (free download)
  • Instruction manuals

Pressure Measurement

  • Measuring Range: -1 to 60 bar
  • Accuracy: ± 0.5 % Full Scale
  • Resolution: 0.01 bar
  • Probe Connection: 3 x 7/16”-UNF
  • Overload Relative (High Pressure): 65 bar

Temperature - NTC

  • Measuring Range: -40° C to +150° C
  • Accuracy: ± 1.3° C (-20° C to +85° C)
  • Resolution: 0.1° C


  • 595 g
  • 127.4 g


  • 77 x 109 x 63 mm
  • 183 x 90 x 30 mm

Operating Temperature

  • -10° C to +50° C
  • -20° C to +50° C

Product / Housing Material

  • Plastic

Protection Class

  • IP54

System Requirements

  • Requires iOS 13.0 / 12.0 or newer
  • Requires Android 8.0 / 6.0 or newer
  • Requires Mobile end device with Bluetooth 4.0

Product Colour

  • Black
  • Black/Orange


  • 10 (when not connected via Bluetooth)

Battery Type

  • 3 AAA Micro Batteries

Battery Life

  • 130 h
  • 150 h

Data Transfer

  • Bluetooth

Radio Range

  • 150 m
  • 100 m

Refrigerants in Instrument

  • R407H, R23, R290, R1234yf, 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, R454A, R124, R402A, R450A, R407F, R416A, R13, R437A, R1234ze, R454B, R402B, R22, R434A, 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

Storage Temperature

  • -4° F to 140° F / -20° C to +60° C

System Requirements (Testo Smart App)

  • Requires iOS 13.0 or newer
  • Requires Android 8.0 or newer
  • Requires mobile end device with Bluetooth 4.0

  • Refrigeration Systems, Air Conditioning Systems, Heat Pumps
    • Determination of High and Low Pressure, Automatic Determination of Condensation and Evaporation Temperature and Calculation of Superheating/Subcooling. All the Results can be read Simultaneously on One Display (in Conjunction with the Appropriate Testo Smart Probes)
    • Tightness Test: Recording and Analysis of the Pressure Curve
    • Automatic Calculation of the Target Superheat (in Conjunction with the Testo Smart App and the Appropriate Testo Smart Probes, e.g. Testo 115i and Testo 605i)
    • Evacuation: Graphic Progression Display of the Measurement with Indication of the Start and Differential Value (in Conjunction with the Appropriate Testo Smart Probe, e.g. Testo 552i Vacuum Probe)
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