Micron Locater Grids
These grids are found to be very useful for AHERA studies. Clean and sharp lines. Index l is 75 mesh for the strong bars and each square is bisected in both directions with thinner bars.

Asbestos Reference Index 3 Grid

200 mesh with alphabetic and number coding
Regular Bar
Mesh: 200
Pitch: 127 microns
Hole: 115 microns
Bar Width: 12 microns