3pcs High Precision SEC Size Estimation Chart 88x58mm Diameter Area Line

3pcs High Precision SEC Size Estimation Chart 107x47mm Covered Diameter Line

Transparency SEC Size Estimation Chart 8cm 0.2mm Diameter Area Line Width

3pcs High Precision SEC Size Estimation Chart 90x55mm 0.12mm Diameter Line

3pcs High Precision SEC Size Estimation Chart 98x55mm 0.12mm Diameter Line

3pcs High Precision SEC Size Estimation Chart 152mm Covered Diameter Area Line

Transparency SEC Size Estimation Chart Diameter Area Line Protractor Gray Scale

Transparency SEC Size Estimation Chart 120mm Diameter Line Width Protractor