testo 557 digital manifold kit with Bluetooth ®

Special Price 50142.00


Extensive accessories included:

  • Set of 4 filling tubes, 2 x clamp temperature probes, precise external Pirani gauge for vacuum measurement and transport case
  • Calculation of superheating and subcooling in real time for 60 refrigerants: no error-prone manual calculation

Extensive accessories included:

  • set of 4 filling tubes, 2 x clamp temperature probes, precise external Pirani gauge for vacuum measurement and transport case
  • Temperature-compensated leakage test, automatic ambient pressure measurement

Product Description

Are you primarily entrusted with the commissioning or maintenance of air conditioning and refrigeration systems, along with heat pumps? If so, the testo 557 is the ideal digital manifold for you: like the testo 550, this digital manifold replaces multiple tools in the air conditioning and refrigeration industry and can be connected to a practical App. As well as the features of the testo 550 manifold, the testo 557 offers a high-precision external Pirani gauge for vacuum measurement: this enables the quick, safe evacuation of refrigeration systems and heat pumps.    

State-of-the-art technology, really easy work: the digital manifold kit in detail  The testo 557 4-way manifold was developed to lighten your workload, to organize your working time more efficiently and to deliver more accurate measurement results – as well as to offer your customers services that are even more reliable. See all the advantages at a glance:   Quick, precise measurement of high and low pressure: two temperature-compensated pressure sensors make this possible and automatically calculate the theoretical evaporation and condensation temperature Simultaneous calculation of superheating and subcooling possible: do away with manual calculations, which are time-consuming and where errors often creep in Including 4 filling tubes, each 1.5 m long: 3 tubes (blue, red, yellow) with 7/16‘‘ UNF (straight and 45° angle), 55/275 bar, 1 tube (yellow) with 5/8‘‘ UNF, 40/205 bar (straight and 45° angle), suitable for all refrigerants Precise external Pirani gauge for vacuum measurement: you get a high-precision Pirani gauge with the digital manifold, enabling you to carry out accurate vacuum measurement and making it easier to evacuate refrigeration systems and heat pumps Two clamp temperature probes included in the scope of delivery: clamp them to the pipes to reliably measure the surface temperature No need to switch over refrigerant hoses: switching is superfluous thanks to automatic heat pump mode Can be used for 60 current refrigerants: 60 refrigerants are stored in the manifold, which you can update if necessary via the smartphone/tablet App and adapt to suit your requirements      Other key functions of the 4-way manifold are temperature-compensated leakage testing and automatic ambient pressure compensation.      

Manifold with practical App: connect the measuring instrument to your smartphone/tablet! You can download the appropriate App for the testo 557 digital manifold onto your smartphone or tablet. The App will make your work easier thanks to its wide range of smart functions:     Remote monitoring of the measurement: you don't need to stay right next to the manifold during the measurement, instead you can monitor the measurement from a distance via your smartphone/tablet; coverage of up to 20 m with no obstructions (at least) Measurement data display on your smartphone/tablet: your smartphone/tablet displays the readings for you while the measurement is ongoing – really helpful when you are making system settings at the same time Practical documentation functions: save your measurement results (in pdf or csv format) and send them directly by e-mail if required. Where applicable, the photos that you took at the measuring location can be appropriately inserted into the documentation using the App Refrigerant update: to ensure that the refrigerants in your digital manifold always remain up to date, you can use the App to carry out a refrigerant update      The App can be used with both Android and iOS systems. After installing the App, manifold and smartphone/tablet can be connected to each other via Bluetooth.    

Innovative technology robustly packaged   A sturdy housing reliably protects the testo 557 digital manifold from impacts (according to protection class IP 42). Thanks to the suspension hook on the back, the instrument is well-secured during the measuring process. The illuminated display ensures optimum legibility of the readings, even if visibility is poor. 


Delivery scope

Testo 557 digital 4-way manifold, including set of 4 filling tubes, batteries (4 x AA) and calibration protocol 2 x clamp temperature probes (0613 5506) Precise external Pirani gauge for vacuum measurement Transport case (0516 0012) App (free download)

Measuring range  -50 to +150 °C
Accuracy  ±0.5 °C
Resolution  0.1 °C


connection  2 x Plug-in (NTC)


Pressure measurement 
connection  -1 to 60 bar
Accuracy  ±0.5 % of fsv
Resolution  0.01 bar


Probe connection 3 x 7/16" – UNF + 1 x 5/8'' – UNF
Overload rel. (high pressure) 65 bar


Vacuum measurement 
Measuring range  0 to 20000 micron
Accuracy ± (10 micron + 10 % of mv) (100 to 1000 micron)
Resolution 1 micron (0 to 1000 micron)
 10 micron (1000 to 2000 micron)
 100 micron (2000 to 5000 micron)
 500 micron (5000 to 10000 micron)
 5000 micron (10000 to 20000 ) 


     General Technical Data         

Weight              3942 g
Dimensions 220 x 125 x 70 mm
Protection class IP42
Product colour Black 
Battery type 250 h (without illumination, without Bluetooth®, without vacuum probe)
Pressure media  CFC
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; R438A; R437A; R442A; R444B; R448A; R450A; R449A; R453a; R452A; R454A; R454B; R455A; R454C; R458A; R502; R500; R503; R507; R718 (H?O); R600a; R513A; R744 (CO?)
System requirements  requires iOS 7.1 or newer; requires Android 4.3 or newer; requires mobile end device with Bluetooth 4.0
Refrigerants update via App R11; FX80; I12A; R1270; R13B1; R14; R142B; R152A; R161; R170; R245fa; R227; R236fa; R401C; R406A; R407B; R407B; R407D; R41; R412A; R413A; R417A; R417B; R417C; R422A; R508B; R426A; R508A; R600; RIS89; SP22
Storage temperature  -20 to +60 °C




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Product DataSheets

Data sheet testo 557


Manual Sheet test 557