High contrast grid for acurate X,Y position calibration, distortion checking of top-viewed stages, video and optical systems. Overall Accuracy ±.003mm, Line-to-Line ±.001mm. Target is a Low Refelction Chrome pattern on white glass
Pattern: Lines at 1mm intervals. Pattern linewidth: Centerlines (horizontal and vertical) and the four outer edge lines are 0.004”. All other lines have a linewidth of 0.003”. Active pattern area: 20.0mm x 20.0mm. Overall dimensions: 1.00”x1.00”x0.10”.