Vishay Spectrol 21-1-11 Multiturn Potentiometer

The Vishay Spectrol 21-1-11 Multidial is a precision 15-turn vernier dial (1-13/16 in diameter) designed for exact position indication and adjustment on multi-turn potentiometers used in instrumentation, laboratory devices, and industrial control systems. It features a 1/4 in shaft, a locking lever, and a satin chrome finish with black markings, mounting directly on the shaft of potentiometers for reliable alignment. The readout is a turn-counting dial that provides accurate 15-turn position indication and fine adjustment control for calibration and setting tasks. Common replacements include Vishay 25-1-11 Multidial, Vishay 16-1-11 Multidial, and Bourns Multi-Turn Dial Assembly.