For quick and accurate measuring, and for convenient inspection of small detail

General-purpose scale measures radii from ¹/₁₆ to ³/₈" (angles in single degrees to 90°; 0.005" and 0.1mm scales; line widths of 0.001, 0.002, and 0.003"). Inch scale measures to 0.75" in 0.005" intervals. Metric scale measures to 20mm in 0.1mm intervals. Protractor scale measures 360° in single degrees.

Precision ground, 7x Hastings triple aplanatic lens can be quickly focused. Long transparent body utilizes maximum degree of light.