A titrator uses the analysis method wherein the sample is made to react with a reagent solution whose concentration is known, and from the volume of the reacted reagent, the result is determned. 
 
Previously, this was judged by the change in indicator solution color when the reagent was dispensed from a glass burette. 
 
Now, the "Automatic Potentiometric Titrator" automatically dispensed reagent, determines endpoint, and calculates concentration!