Complete system with main unit, titration vessel, diaphramless generator cartridge, sensing electrode, straight vent tube, stir bar, 1 mL sample syringe with needle, indicating silica gel, sealing grease, pennyhead stopper for gas port, thermal paper (5 rolls/pkg), pyridine-free reagent kit and instruction manual. For operation on 110V/220v, 50/60 Hz.