Concentric Circle Reticles

KR-506 Concentric circles reticle (19 circles) with diameters equal 0.020" - 0.200" in 0.010" increments with crossline. No numbers. Learn how to make accurate measurements when using your reticle here and learn about calibrating your microscope here...

KR-504 Concentric circles reticle (30 circles) with diameters equal 0.010" through 0.300" with crossline. Numbered 2, 4, 6.....30 every 2nd line. Learn how to make accurate measurements when using your reticle here and learn about calibrating your...