The Mettler Pencil Electrode Set (#2023) includes a carrying case, handle, and four different sizes of stainless steel spot electrode tips. Warranty: 1 Year. The Pencil Electrode with push button stimulation control is used for manual stimulation procedures where pin-point control is required. It comes in its own carry case with four stainless steel tips from the size of a quarter down to a point. The electrode has an on/off switch so that stimulation can be turned on and off. It requires a banana type connector to be plugged into the electrode cable set. Features Mettler Pencil Electrode Set Features Pin-point manual stimulation. Four electrode tip sizes for effective "spot" stimulation. Tips easily connect to Pencil Electrode handle. Has an on/off switch to regulate stimulation. Compatible with all Mettler stimulators.