The 91AR500LF is a Model 91 single-turn cermet trimming potentiometer featuring a 3/8" diameter body with top adjustment and solderable terminals for PCB mounting. It offers a resistance range of 10 ohms to 2 megohms with ±20% tolerance, a maximum input voltage of 250 Vdc or rms, and a power rating of 0.5 watts at 70°C. The device provides essentially infinite resolution with a nominal electrical travel of 174°, maximum end resistance of 2 ohms, and contact resistance variation of 1% or 1 ohm (whichever is greater). Operating over a temperature range of -55°C to +125°C with a temperature coefficient of ±100 ppm/°C, the 91AR500LF is ideal for precision circuit calibration, signal conditioning, and equipment tuning applications where reliable, compact adjustment is required.