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    Working Principle of Levels
    A level is a measuring tool that establishes a horizontal line of sight to determine the height difference between two points on the ground. Its main components include the telescope, tube level (or compensator), vertical axis, base, foot screw. According to the structure, the level is divided into micro-tilt level, automatic compensated level, laser level and digital level (also known as electronic level). According to accuracy, it can be divided into precision level and ordinary level. Automatic compensated instrument Automatic compensated level is a level that obtains horizontal sight line by means of automatic compensator.
    Working Principle of Plant Growth Lights
    The operating principle of plant growth lights is as follows: The light provides a light spectrum similar to that of sunshine or is suitable for cultivating plants. The light sends different colors and changes its lumen output (intensity) to simulate the varied temperatures and spectrum output of the outdoor condition. As the category of cultivated plants, cultivation stage (such as germination/vegetative stage or florescence stage/fruiting period) and the light cycles needed by plants vary, the spectrum stage, lighting efficiency, and color temperatures should be adjusted flexibly.