Verifire HDX vs Verifire MST: Which Interferometer Fits?
By Zygo | Published: 2026-10-15
Category: Comparisons
Compare Verifire HDX and MST on aperture, zoom, and certification. See which Zygo interferometer matches your shop's test needs and budget.
Quick Answer
Choose the Verifire HDX if you need a 6-inch aperture with encoded zoom and focus for flexible, high-resolution testing. Choose the Verifire MST if your work centers on smaller optics and you want a compact, cost-effective interferometer. Neither is universally better; the right pick depends on your part sizes, required resolution, and whether you need certified reference standards.
Key Differences That Affect Your Measurements
The most visible difference is aperture. The Verifire HDX offers a 6-inch aperture, which lets you test larger optics in a single pass without stitching. The Verifire MST typically has a smaller aperture, so it suits smaller components but may require stitching for larger parts.
Zoom and focus control also differ. The HDX includes encoded zoom and focus, which means the system can report and reproduce zoom and focus positions electronically. This is useful for repeatable setups and automated recipes. The MST may rely on manual adjustments, which is fine for low-volume work but slower for production testing.
Certification and Traceability Options
If your quality system requires traceable calibration, Zygo offers certified reference standards such as the 88nm Step Standard with ZYGO Certification. This step standard is supplied with ZYGO certification and is associated with an ISO 17025 certified laboratory. It can be used to verify the performance of either interferometer model, but it is a separate purchase.
Both the HDX and MST rely on Zygo's interferometry platform, but the availability of certified accessories and spare parts may vary. For example, the Verifire USB3 Camera Assembly is a spare part that requires a certified Zygo Field Service Engineer for proper installation. This is a reminder to factor service access into your ownership plan.
Which Model Matches Your Shop's Workflow?
For shops that test a mix of small and medium optics, the HDX's 6-inch aperture and encoded zoom provide headroom and automation-friendly features. If your parts are consistently small and your volume is low, the MST may be sufficient and more economical.
Consider your future needs: if you expect to add larger parts or automate testing, the HDX's encoded axes can save setup time. If you need to certify your measurements, plan for a certified step standard and ensure you have access to Zygo field service for any camera or major assembly replacements.
Trade-Offs at a Glance
- Aperture Size: HDX: 6-inch aperture for larger optics; MST: smaller aperture suited to compact parts. If you regularly test parts larger than a few inches, HDX avoids stitching.
- Zoom and Focus Control: HDX: encoded zoom and focus for repeatable, programmable setups; MST: may require manual adjustment. Choose HDX for automation or high-throughput; MST for manual, low-volume work.
- Certification and Service: Both can use certified standards like the 88nm Step Standard; camera replacements need Zygo field service. Factor in the cost of certified standards and service access for either model.
Product Facts
- 1.064 µm Verifire Interferometer with 6 in. Aperture: The ZYGO 1.064 μm Verifire Interferometer with 6 in. aperture is offered with encoded zoom and focus. Encoded zoom and focus enable repeatable, programmable setups, which is valuable for automated or high-mix testing.
- 88nm Step Standard with ZYGO Certification: The 88nm Step Standard with ZYGO Certification is supplied as SKU 6300-0917-01 and is associated with an ISO 17025 certified laboratory. This standard provides traceable verification for your interferometer, supporting quality audits and calibration requirements.
- Verifre USB3 Camera Assembly: The Verifire USB3 camera assembly requires a certified Zygo Field Service Engineer for proper installation for a minimum of 5 hours. Budget for professional installation when planning camera upgrades or replacements to avoid downtime and ensure proper function.
Fit Guidance
Best For
- Shops testing a variety of part sizes up to 6 inches
- Production environments needing repeatable, automated setups
- Labs that require traceable certification with a step standard
Not For
- Shops with strictly small optics and minimal automation needs
- Buyers with a tight budget who don't need encoded axes
- Anyone without access to Zygo field service for camera installation
