Used to calibrate eyepiece graticules.
Vacuum deposited, chrome image on a square of glass with a cover glass cemented on top and mounted on a stainless steel slide mount. With UKAS certificate of calibration. For use with transmitted light.
Used to calibrate eyepiece graticules.
Vacuum deposited, chrome image on a square of glass with a cover glass cemented on top and mounted on a stainless steel slide mount. With UKAS certificate of calibration. For use with transmitted light.