Hellma® calibration plate R113 for microplate readers for checking wavelength accuracy, photometric accuracy and linearity, consisting of: Column 1+2: Reference (blank), Column 3+4: Neutral density glass filter (0.5 Abs), Column 5+6: Neutral density glass filter (1.0 Abs), Column 7+8: neutral density glass filter (1.5 Abs), Column 9+10: neutral density glass filter (2.0 Abs), Column 11+12: Holmium oxide glass filter Photometric accuracy calibrated at 8 measuring points each at wavelengths 405, 450, 490, 650 nm, slit width: 1 nm Wavelength accuracy calibrated at 8 measuring points at wavelengths 279, 361, 453, 536, 638 nm, slit width 1 nm In high-quality storage box with serial number and DAkkS calibration certificates Hellma® calibration standards are manufactured 100% in Germany. Compliant with regulations Hellma® calibration standards comply with the specifications of quality management systems and pharmacopoMostra di piùMostra meno