500R Trimpot Variable Resistor

A 500 ohm trimmer potentiometer designed to be set once during calibration and then left alone, rather than adjusted by a user. It mounts directly on a PCB and is adjusted with a small screwdriver, which is exactly what you want for a sensitivity threshold, a bias point or a contrast setting that should not move afterwards. Far smaller and cheaper than a panel potentiometer since it needs no shaft or knob. Set once during calibration, then left alone; Screwdriver adjustment resists accidental movement; PCB mounted, no panel space required; Much cheaper than a shafted potentiometer