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General:
Spectral Engine: i1® technology (holographic diffraction grating with diode array)
Spectral range: 380 – 730 nm
Optical bandwidth: 10 nm
Sampling interval: 3.5 nm (100 bands)
Spectral reporting: 10 nm
Interface: USB
Physical dimensions:
i1iSis (A4+) Width 42 cm, depth 16 cm, height 12 cm (16.5 x 6.3 x 4.7 inches)
i1iSis XL (A3+) Width 52 cm, depth 16 cm, height 12 cm (20.5 x 6.3 x 4.7 inches)
Weight:
i1iSis: 3.2 kg (112.9 oz)
i1iSis XL: 3.9 kg (137.6 oz)

Reflection:
Inter-instrument agreement: Average 0.4 DE*94 (deviation from X-Rite manufacturing standard at a temperature of 23°C on 12 BCRA tiles (D50, 2°))
Short-term repeatability: 0.1 DE*94 (D50, 2°), on white

Chart Specifications:
Paper Width: i1iSis (A4+): 6 to 23 cm (2.4 to 9 in.)
i1iSis XL (A3+): 6 to 33 cm (2.4 to 13 in.)
Paper Length: 17 cm to 66 cm (6.7 to 26 in.)
Paper Thickness: 0.08 to .45 mm