Set the test point at a certain height above the work surface. By distributing test points evenly throughout the clean room. At least one sample was collected at the center of each point, at a height of 1.5 m above the ground.
By evenly distributing the test points in the clean room, set the test points at a height above the working surface. Collect at least one sample at the center of each point 1.5 meters above the ground.
Set test points at the height above the working face, evenly distribute the test points throughout the clean room, and collect at least one sample at the center of each point, with a height of 1. Five meters above the ground