Thompson for Dust Analysis
Eyepiece Reticle with Squares identified A, B and C and are sized 4mm, 7mm and 10mm. Horizontal Scale is 10mm subdivided into 100 divisions of 0.1mm (100µm).
£146.45 - £172.68
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For counting particles in any of three areas of known size. The graticle is calibrated in the same manner as a normal eyepiece scale. The result is then used to calculate the area of any square.
Soda Lime 1.5mm thick
Correct reading through glass