How to identify a potentiometer?

It looks like it would be a 3k ohm potentiometer. The resistance value will only change if you are testing between the wiper and one of the outside terminals. Since it is for speed control, it is mostly likely a linear taper, but you can confirm by testing the resistance at 50% like the previous post indicated. If it is roughly 1500 ohms at 50%, then it would be linear. We don’t carry anything in stock at 3k ohms. Closest option is this one at 3.5k - 480-5942-ND