dTable = NernstCal2026Jul29;

dtString = dTable.DateTime;
dt = datetime(dtString, 'InputFormat', 'yyyyMMMdd''T''HHmmss.SSS');

indexes = find(dTable.pH == 0);
dTable.pH(indexes) = NaN;

plot(dt,dTable.pH)
xlabel('Date and Time');
ylabel('pH');
title('Endress&Hauser pH vs. Time');
grid on;