The Holmium Oxide Glass Filter is a precision wavelength calibration standard designed for verifying the wavelength accuracy of UV-Visible spectrophotometers. Manufactured from high-quality holmium oxide-doped optical glass, it provides multiple certified absorption peaks across the UV and visible spectrum, making it an ideal reference standard for routine instrument calibration and performance verification.

Unlike liquid standards, this solid glass filter offers exceptional stability, long service life, and easy handling without the need for sample preparation. It is widely used in pharmaceutical laboratories, research institutions, universities, environmental testing laboratories, and quality control facilities to ensure accurate spectrophotometric measurements.