Witness Samples

Witness Samples are essential to maintaining accuracy, repeatability and traceability of any thin film coating operation. Witness Samples aid in the measurement of transmission and reflectivity performance. They are also used to measure the durability of a coating and verify the resistance to environmental effects like humidity, temperature, salt spray, etc.

Esco offers a full compliment of witness samples in three different configurations: Transmission, Reflection and Wedged. Most common generic indices as well as specific optical glass manufacturer's types are available. We can also supply melt specific materials at a competitive cost to our customers. Please note that specific optical glass and material pricing fluctuates, and may be subject to change.

Quality Optics from a Trusted Supplier

American Owned & Operated

Esco Optics is a leading manufacturer of custom and catalog optics, precision optical components, and ITAR optics in the United States.

Military & Defense Supplier

As the leader for military and defense optics in the United States, Esco Optics adheres to the International Traffic in Arms Regulations.

ITAR Registered & Compliant

ITAR registered and compliant, Esco manufactures ITAR optics for all of its customers with the strictest confidentiality.