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The principle of operation is based on measuring the zonal reflection coefficient of a compacted-smoothed flour surface using a built-in standard. The laboratory white meter BARS is approved as a type of measuring instruments and is registered in the State Register of Measuring Instruments under No. 78409-20. All manufactured devices undergo primary verification and have the appropriate certificate. Due to the two-channel design of the device (the presence of two photometric units and a cuvette with two cells), parallel measurements of the whiteness of one flour sample are carried out simultaneously, the average value is calculated automatically, which significantly reduces the time of analysis. The sealing of the flour sample with a fixed force and pressing against the optical windows ensures the same measurement conditions and eliminates the influence of a subjective factor on the result. The automatic adjustment system based on the built-in standard allows to ensure long-term stability of the device without the need for manual adjustment. During operation, the standard is set to the working position by an additional drive. Mechanical damage or loss of the standard is excluded. The output to the operating mode is no more than 30 seconds. The determination of whiteness is carried out in 15 seconds. To determine the whiteness of flour, the operator needs to fill 2 compartments of the cuvette with the test sample of flour, install the cuvette in the device and start the measurement process. All the results of the whiteness definitions are stored in the archive. The operator has the opportunity to view the electronic measurement log.