Check plug size, not easy ...

There are several plug sizes, this was perfect. There was no precise information on the figures in terms of size / diameter of the circular connector, I have measured the diameter of the circular plug in relation to the square connector on the screen. Fortunately, there was a picture showing this in front view of the same distance. With an existing power supply I had a square original plug for the new Lenovo is available and therefore the reference to me then calculate the Diameter of the round. A comparison of the calculated value with the car power supply (for I needed this adapter), showed that it would fit. And it did then.

Please specify plug Dimensions: Tip the seller Saves time when shopping, or would certainly reduce the return rate.