available features include ( i ) user-logical commands , ( ii ) rapid , accurate construction and display of calibration curves ( fitted by least squares non-linear regression ) , ( iii ) analysis of data ( stored either on- or off-line ) , with correction for drift and conversion from voltage or length to ion concentration or activity , ( iv ) calculation of selectivity coefficients , ( v ) optional storage and use of activity coefficients , and ( vi ) output of data , calculations and graphics to printer and plotter .
C1521970
features
C1444754
length