The 31418111 is a precision plane-parallel test glass manufactured by TESA for calibration, optical inspection, and metrology applications requiring extremely high flatness and dimensional accuracy.

This 77 mm diameter optical reference glass is designed for checking surface flatness using monochromatic light interference methods, making it essential for precision measurement laboratories and industrial calibration environments.

Key features include:

Diameter: 77 mm
Precision plane-parallel optical surface
High flatness accuracy for metrology verification
Manufactured from high-grade optical glass
Designed for interference-based flatness inspection
Used for calibration of surface plates and precision components
Scratch-resistant polished optical finish
Laboratory-grade dimensional stability
Suitable for inspection, calibration, and metrology applications
This test glass is widely used in quality control laboratories, calibration facilities, and precision engineering environments where accurate verification of surface flatness is critical for maintaining measurement standards.