Actual size

No. of pixels in defect portion

Measured size (mm)

% of Error

Ø 8 mm, 1 mm depth

52.1

7.7

3.8

Ø 8 mm, 2 mm depth

53.1

7.8

2.5

Ø 8 mm, 4 mm depth

54.0

7.9

1.3