4" Verifire SV 25_04

The upgraded 4-inch aperture on this unit gives me crystal-clear fringe patterns during alignment — noticeably better than my old 6-inch model's fuzzy edges. The Zygo certification paperwork was thorough, and the unit fired up on the first try after re-calibration.

The serial number upgrade to 4" was exactly what I needed for my calibration setup, and it arrived looking brand new. Took it out of the box and it was aligning perfectly within minutes.

The Zygo certification gave me confidence in the measurement accuracy right out of the box, and the 4" aperture was exactly what I needed for my larger optics. It feels solidly constructed and the serial number tracking is a nice bonus for documentation.