RK1631210-F15-21-B502-P
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39300910-RK1631210-F15-21-B502-P
Rotary Potentiometer, 5 kOhm, 1Turn, 100 mW, ± 20%
Tolerance is the percentage of error in the resistor's resistance, or how much more or less you can expect a resistor's actual measured resistance to be from its stated resistance. A gold tolerance band is 5% tolerance, silver is 10%, and no band at all would mean a 20% tolerance.