G57

Often referred to as the Pharmaceutical PSA pattern, European Pharmacopeia pattern or IMA Reticle (USP 788). 

Normally used on a microscope with 10x objective lens so that the main circle diameter equates to 1mm at the stage. If other objective magnifications are used, request a quote for a special calibration factor. We recommend that the PS8 Micrometer Scale with UKAS certificate of calibration is also purchased to calibrate the G57 reticle and provide measurement traceability for ISO. 

Line Thickness

0.010mm +/-0.003mm

Glass Type and Thickness

Soda Lime 1.5mm thick

Overall Tolerance

+/-0.005mm

Diameter Tolerance

+0/-0.1mm

Divisional Marker Lengths

1.8mm, 1.25mm, 0.75mm

Orientation

Correct reading through glass