If you calibrate a PH-BNC electrode with an Electrode Amplifier (EA-BTA), typical potential readings are
-pH 4 buffer solution: 1.56 volts
-pH 7 buffer solution: 1.17 volts
-pH 10 buffer solution: 0.80 volts

If you calibrate a PH-BNC electrode with a Go Wireless Electrode Amplifier (GW-EA), typical potential readings are
-pH 4 buffer solution: 0.17 volts
-pH 7 buffer solution: 0.00 volts
-pH 10 buffer solution: -0.17 volts

These values are also true for any of our PH BNC electrodes: FPH-BNC, GPH-BNC