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Brightness Meter 1.Description: This brightness meter is mainly used to measure the whiteness of paper, paperboard, paper pulps, pulps of chemical fiber, cotton, chemical fiber, textile, plastic, starch, salt, white cement, porcelain clay and talcum powder, etc. It can also be used to measure the opacity and other optical performance of thin pages. 1.1Measure the diffuse blue reflectance factor (R**7), which is also called “blue brightness” or “ISO brightness”. 1.2Analyze whether the sample material contains fluorescence brightener, and measure the fluorescence brightness produced from fluorescence emission. ***** brightness degree. 1.3Measure the brightness stimulus value Y*0 of sample, *****diffuse green reflectance factor Ry. 1.4Measure the transparency, opacity, optical-absorption coefficient and light-scattering coefficient of samples. 1.5Measure the ink absorbency of paper and board. ***** technical features: 2.1 Measure and digital display the whiteness, fluorescence whiteness and opacity (%), etc. 2.2 Zero drift: ≤0.1 2.3 Indication drift: ≤0.1 2.4 Indication error: ≤0.5 2.5 Repeatability error: ≤0.1 2.6 Error of specular reflection: ≤0.1 2.7 Sample size: testing surface is not less than Φ*0mm, thickness of sample is not exceeding *0mm 2.8 Power: ******0V, *0Hz, 0.3A 2.9 Working environment: temperature is ***0℃, relative humidity is not exceeding *5%. 2.*0 Size and gross weight: **0***0***0mm, *0Kg