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The Unico Holmium Wavelength Calibration Filter (#S-90-9115) includes a calibration certificate.
Warranty: 1 Year.
The Holmium Filter is a factory certified wavelength accuracy filter that is durable, easy to use, and will make an incredible enhancement to your spectroscope.
The filter is mounted in the black anodized aluminum holder and has the same external dimensions as standard 10 mm square cuvettes. This design assures compatibility with all instruments manufactured by Unico (such as the S2150 Series spectrophotometers) as well as other major brands.