TESTO 557 - Page 11

4 Product description
11
6 Control keys:
Key Function
[Set] Set units
[R, ►, ■]
Select refrigerant / Start-Stop leak test
[Mode]
Switch between measuring modes
[Min/Max/Mean]
Display min, max, mean values
[▲] Up-key: Scroll through menu.
[P=0] Pressure zeroing
Esc Switches to the measurement/home view.
[▼] Down-key: Scroll through menu.
[ / ]
Switching the instrument on/off
Switching display ilumination on/off.
7 Inspection glass for refrigerant flow.
8 4 x valve stem shutoff
9 4 x hose holders for refrigerant hoses
10 Connection 1/4" SAE, brass.
High pressure, for refrigerant hoses with quick release screw
fitting, passage for valve actuator lockable.
11 Connection 3/8" SAE, brass, for vacuum pump
12 Connection 1/4" SAE, brass, for e.g. refrigerant cylinders, with
screw cap.
13 Connection 1/4" SAE, brass.
Low pressure for refrigerant hoses with quick release screw
fitting, passage for valve actuator lockable.
14 Mini-USB connection for firmware update, inside the battery
compartment.