
Leaves marks on my sensor. The gel has a concave shape, which means only its edge makes contact with the sensor, and if you try to push the center of the gel into contact with the sensor, the edge will push out, causing it to move across the sensor. , and this is exactly what you should avoid. The more expensive counterpart of this product is more convex so you don't have to apply as much pressure and more gel touches the sensor for a much better result.

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