TESTO 557s - Overview of the Testo 557 S

6 Product description
9
release screw fitting; passage
can be closed via valve
positioner Centre: e.g. for
refrigerant bottles, with sealing
cap, refrigerant hoses with quick-
release screw fitting; passage
can be closed via valve
positioner.
6.2 Overview of the testo 557s
1
Mini-DIN probe socket for NTC
temperature probe, with socket
cover
2
Foldable suspension device
(rear).
3 Display. Instrument status icons 4
Rear
•
Battery compartment
•
Mini USB port for firmware
update
It is not possible to charge
rechargeable batteries in the
instrument.
5
Control keys
6
Sight glass for refrigerant flow