## 1 Introduction  
Pigments, representing organic molecules, have a decisive role in the process of plant photosynthesis. They absorb different wavelengths of light and convert them into energy. The energy thus obtained from sunlight is transformed into chemical energy, which is used for the synthesis of glucose and other sugars, playing a key role in the production of nutrients. Pigments in plants are found in the chloroplasts of their cells, the most common being chlorophyll, carotenoids, and anthocyanins. Each of them has a specific function and can be an informative sign of plant condition and growth [1]. Methods of analytical chemistry, including chlorophyll extraction and spectrophotometric measurement, are classified as sufficiently accurate for determining the concentration of pigments in plant leaves [2]. Obtaining reliable results with these techniques involves using solvents such as acetone, ethanol, or methanol and calculating extinction coefficients to convert absorbance values into pigment concentrations [3]. However, methods based on non-destructive techniques, such as digital photography, aerial photography, and miniaturized systems for the estimation of pigment concentration, have been developed and researched in recent years. Regardless of these developments, analytical methods remain the gold standard. However, non-destructive techniques have practical advantages, such as the direct availability of results, the fast time it takes to obtain them, and the easy periodic monitoring of plants. The development of mobile devices to determine the number of pigments in plants is not new. Different manufacturers offer such technical means in commercial networks. The more common mobile devices measure the properties of transmitting light in the VIS and NIR spectral ranges. The light sources are LEDs with a fixed spectral wavelength. The majority of devices are primarily designed to measure chlorophyll. Nitrogen can be measured indirectly based on chlorophyll readings. Some of the devices have a GPS sensor for positioning and memory for the measurement data. Some meters, such as the MPM-100 (Opti-Sciences, Hudson, NY, USA), are stand-alone computing stations capable of displaying spectral data and performing calculations. The N-tester device (Yara International ASA, Oslo, Norway) connects to the camera of a mobile phone and uses all the functionality of this type of communication means. The mentioned devices offer portability, versatility in pigment measurement, and the utilization of relevant spectral ranges. However, the limitations include a limited range of measurements, fixed wavelength LEDs, potential limitations in functionality and calculations, and dependency on mobile phone connectivity for some devices. These factors should be considered when selecting and utilizing these devices for plant pigment analysis. The development of mobile devices for the determination of pigments in plants is the subject of scientific developments at the present time [4; 5; 6]. In recent years, mainly low-cost devices have been created. Devices are proposed for the determination of chlorophyll and flavonoid pigments, as well as nitrogen pigments [7; 8; 9]. Spectral characteristics in the range 405-1100 nm (VIS and NIR) have been used. The accuracy achieved against a reference measurement is 63-99%. Photosensitive elements, spectrophotometric sensors, and video cameras are used as detectors [10; 11; 12]. The mentioned devices offer affordability, versatility in measuring different pigments, and the utilization of a broad spectral range. However, limitations include potential variations in accuracy, a lack of detailed performance information, limited information on data processing and analysis capabilities, and potential constraints associated with low-cost designs. These factors should be considered when selecting and utilizing these devices for pigment analysis in plants. According to [PERSON] et al.