P16S Knob Potentiometer with Switch Vishay / Sfernice P16S Knob Potentiometer with Switch features a low profile, small size, potentiometer in a knob, and is IP67 sealed. Vishay / Sfernice P16S Knob Potentiometer with Switch is a revolutionary concept in panel-mounted potentiometers. This unique design consists of a knob driving and incorporating a cermet potentiometer. Only the mounting hardware and terminals are situated on the backside of the panel producing a minimum required clearance. Applications for the P16S Knob Potentiometer with Switch include military, industrial, and medical.