Walton & Beckett 1996
Eyepiece Reticle with Walton/Beckett (1996) for Asbestos. All with calibration factor of 4 for use with 40x objectives.
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Based on the G22, the G25 is produced to a new design by the Institute of Occupational Health.
Soda Lime 1.5mm thick
Correct reading through glass