WK-58-1890 Magnetic Mirror:

• Checks the perpendicularity of any flat surface to a line of sight by means of auto reflection or auto-collimation.
• The mirror has a circular front surface with a 2½” diameter.
•  Its reflecting surface is flat to within a ¼ wave length in 50 mm diameter.
• Single magnet parallel to ± 3 seconds of arc.
• Also available in 4” diameter (WK-58-1894) and 6” diameter (WK-58-1846).
• Three magnetic feet are cemented to the back of the 4” and 6” mirrors.