Sper Scientific 860031 pH - mV Bench-Top Meter - Manual (Page 8)

8
POWER SUPPLY
The meter is powered by a 9 Volt DC adapter (included).
The plug of the adaptor is USA type; you will need to
purchase a plug converter if using the meter outside of the
US.
Plug the adaptor into the power port labeled “DC,” located
on the rear of the meter.