Whipple Grid 100 squares in 10mm² area (10x10 Grid), centre square further divided into 5 x 5 grid. 7mm² standard version also available
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Originally designed for water particle analysis, it can be used for other aspects of particle counting. Ratio of full square to smallest is 50:1. Area Ratio is 1200:1
0.015mm +/-0.003mm & 0.020mm +/-0.003mm CL
Correct reading through glass
Soda Lime 1.5mm thick