The purpose of this instrument is the main measurement of paper and paperboard, pulp and chemical fiber pulp, the whiteness of cotton and chemical fiber, textile, plastic, ceramic, Tong porcelain, starch, salt, white cement, clay, talc and other objects. You can also measure the optical properties of the opacity of the sheet materials. The main technical characteristics The instrument meets GB3978-83; standard illumination and lighting conditions of observation. Analog D65 illuminant lighting. D / o lighting observing geometry conditions, diffuse ball diameter 150mm, test hole diameter 30mm, with light absorber to eliminate the impact of the sample mirror reflected light. Whiteness (R457) of the optical system spectral power distribution of the peak wavelength of 457nm, the half-height width 44 nm, Y10 optical system found GB3979-83; the measuring method of the object color. 2, is measured and the figures show that the whiteness, fluorescence (whitening) whiteness, opacity (%). 3, zero drift: ≤ 0.1, showing the value of drift: ≤ 0.1 5 Indication error: ≤ 0.5 6 repeatability error: ≤ 0.1 7 specular reflection error: ≤ 0.1 8 Sample size: not less than the test plane Φ30mm, thickness of the sample does not exceed 40mm 9, Power Supply: AC 170 ~~ 264V, 50Hz, 0.2A 10 working environment: Temperature 0 ~ 40 ° C, relative humidity not more than 85% of the 11, the size and weight: length × width × height = 365 × 260 × 425 mm, 11kg