A procedure is reported for the evaluation of the behavior of an automatic recording titrator in nonaqueous titrations and is applied to an instrument composed of commercially available units. First, the behavior of the purely instrumental features was determined and the experimental errors were compared with calculated maximum anticipated relative values. The instrument's function in this case was within expectation. Then, the response of the titrator was evaluated from titration curve properties of two compounds in acetic acid and two other compounds in iso-propanol. The following maximum relative errors, with instrumental errors discounted, were observed: range, 1.5 per cent; end point potential, 4.4 per cent; analytical results, 1.0 per cent; slope of the rapidly rising portion, 11.4 per cent. On the basis of satisfactory instrumental response and reasonable titration curve errors, the relatively inexpensive unit used here is found reliable for general laboratory use. The procedure described is recommended for use in evaluating any automatic potentiometric recorder.