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 Figure 2c. Seven hole sampler used for inhalable dust sampling in the UK. Sampler is made of conductive plastic and operates at 2 L/min.

Figure 2d. Button sampler. So-named because the inlet, a hemispherical screen with ~380 :m diameter holes, resembles a large button. Developed as an inhalable sampler with reduced wind direction response and improved filter deposit uniformity. Uses metal construction and operates a 4 L/min.

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NIOSH Manual of Analytical Methods