Nova-Tech pH 700 Ion 700 - Manual (Page 5)

2.2 LCD Annunciators
2.3 Meter Connections
pH
BNC connection for pH, ORP (Redox), or Ion Selective
Electrodes (ISE).
REF
Pin connection for half cell reference electrodes.
Requires separate half cell BNC electrode.
Note: REF is not commonly used and is not required.
ATC For Automatic Temperature Compensation probe.
DC Power supply.
3