NIST-Compliant and NIST-Traceable photometric neutral density calibration standards are calibrated in the ISO-17025 accredited facility.

VIS and UV-VIS calibrations are provided at standard wavelengths specified by NIST SRM 930e, 1930, 2930, and  2031c (www.NIST.gov/srm)

NIR calibrations are provided at following standard wavelengths: 700, 1100, 1700, 2500, and 3000nm (the wavelength point of 3000nm may need to be 2800, 2900 or 2950nm due to a material lot variation).

UV-VIS-NIR calibrations are provided at following standard wavelengths:  250, 360, 465, 546.1, 635, 1100, 1700, 2210, 2500, 2850nm (the wavelength point of 2850nm may need to be 2800, 2900 or 2950nm due to a material lot variation).

Optional calibrations at custom wavelengths are also available and quoted on per-case basis.

NIST-compliant and NIST-Traceable Liquid Potassium Dichromate Photometric Linearity calibration standards are offered here