Model: ZMI‑7712 Part Number: 8070‑0159‑02 Manufacturer: ZYGO (AMETEK) Type: HeNe, CW, Two‑Frequency (Heterodyne), Linearly Polarized Application: High‑precision interferometry, multi‑axis metrology, long‑range & high‑stability measurements Cooling: Water‑cooled Optical Isolation: Yes Beam Diameter: 6 mm Weight: ~3.9 kg Status: Obsolete (legacy high‑precision unit)