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this unit works much too coarsely and lacks a gradual increase in speed so it looks like the designer of this controller got his components list wrong. its seems robust enough but if you want precise control of speed then it`s not for you it can go from no speed to flat out in less than a quarter turn of the knob so its hard to get the speed right, it could definitely do with 2 ajuster`s to trim it for max and minimum speed. the price is great but the item is`nt. have ordered a better one so will see if that is ok.
Verified purchase: Yes | Condition: New