A syringe apparatus for use with balloon-tipped catheters is disclosed having a pressure gauge and timer assembly. In one mode, the timer assembly displays the duration of a current event of inflation or deflation, and the duration of the most recent past event of inflation or deflation. In another mode, the timer assembly displays historical information showing the event number and duration of past events of inflation and deflation. The pressure gauge display and the timer assembly display are situated conveniently on the syringe assembly and in proximity to one another so as to enable a syringe operator to substantially simultaneously monitor durations of inflation and deflation without the need for an assistant, yet without requiring purchase or use of computerized monitors. In another mode, the timer assembly can be detached from the syringe assembly at the completion of an inflation procedure and then reused with another syringe assembly. In this mode, the pressure gauge is permanently mounted to the syringe assembly, or alternatively, it is mounted to the detachable timer assembly so as to also be reusable.