CM-500 Chlorophyll meter can instantly measure the relative chlorophyll content of a plant leaf,and the measurement data will be shown on the LCD screen of the instrument. The chlorophyll content of a plant leaf indicates the status of the plant itself, and well-grown plant leaf contains more chlorophyll. Chlorophyll content is closely related to the nitrogen content of the leaf. Therefore the chlorophyll measurement can also reveal the true nitro-radical demand of the plant. Using this type of instrument will facilitate the rational applying nitrogen fertilizer, thus enhancing the nitrogen utilization rate.