A pellicle correction factor is determined by comparing a first measurement of a reference photomask alone with a second measurement of that reference photomask through a reference pellicle protecting the mask layers of the photomask. Each set of two poles is placed into or supported vertically on the ground at opposite ends of a playing field, and an inverted cup is placed on top of each pole. The first conveyor is disposed near one side of the platform for conveying boxes to be cut.