The smart plant chlorophyll meter can help you quickly measure the relative chlorophyll content (SPAD units) or "greenness" of your plants so you can understand your plants' actual nitrogen needs. This instrument can improve plants' demand and utilization rate for nitrogen fertilizer and protect the environment. Specification: Power supply: 4.2V rechargeable lithium battery Battery capacity: 800MAH Measuring range: chlorophyll: 0.0-99.9 SPAD, nitrogen content: 0.0-99.9 mg g Measuring area: 2mm 2mm Measurement accuracy: chlorophyll: within 1 SPAD unit (0.0-50.0 SPAD under normal temperature and humidity), nitrogen content: 5 . Repeatability: Chlorophyll: Repeatability within 0.3 SPAD units (0.0-50.0 SPAD measurement position remains unchanged), Nitrogen content: 0.5 units. Data storage medium: SD card storage Data storage capacity: 2GB Measurement interval: less than 3 seconds Working and storage environment: -10 -50? relative humidity 85 Product size: 140×85×45mm Weight: 250g Due to manual measurement, there may be an error of 1-3cm, I hope you can understand. contact us: If you have any questions or needs, you can contact us at any time.?Storage Data?The multifunctional chlorophyll meter has a storage capacity of 2GB and can store multiple measurement data. Past data can be viewed in historical query data. Even if there is an unexpected power outage, the data will not be lost. ?Backlit Display?The chlorophyll meter has a backlit LCD display for clear and intuitive reading of data. It is small and easy to carry. When measuring, just place the leaves of the plant on the measuring position and wait 2-3 seconds to obtain the measurement data. ?Working Principle?The multifunctional chlorophyll meter measures the relative content of chlorophyll in leaves by measuring the light transmittance coefficient of leaves in two wavelength ranges. The LED light source emits two kinds of light, one is red light (peak wavelength is 650nm), and the other is infrared light (940nm). ?Multi-Function?The chlorophyll tester can not only measure the chlorophyll content of plants, but also the nitrogen content, leaf temperature and humidity of plants. ?Measurement range?Chlorophyll: 0.0-99.9 SPAD, Nitrogen content: 0.0-99.9 mg g, Measuring area: 0.0-100 SPAD.