SPI 45X Centering Scope - 40-149-7

Enables operator to locate work for drilling, boring, etc, on vertical milling machines, jig borers or drill presses.
Edges, lines or punch marks on work piece can be quickly located or centered relative to the axis of the machine spindle.
To use, simply place instrument in machine, locate lines on work to match crosshair lines in viewing aperature.
Knurled sleeve on lower end of scope is turned to compensate for misalignment.
The work layout intersection is now in the exact center of the spindle axis, ready for cutting tool.
True position accuracy +.0001".
Crosshair reticle for use as reference of X and Y axis.
Overall height: 3" Shank dia 3/8".
Eyepiece angle 60°.
Field of view 1/8" Working distance 1" from lens.