Plant Nutrition Tester (chlorophyll meter) Brand: Teng-meter Model: TY-4N First, use chlorophyll meter can instantly measure the relative content of chlorophyll of plants (in SPAD) or 'green degree, nitrogen content, leaf moisture, leaf surface temperature, which can understand the plant's nitro help you understand the lack of demand and the degree of soil nitro or if too much fertilizer is applied. You can increase the utilization of this instrument to nitrogen fertilizer, and protection of the environment (to prevent applying too much nitrogen leaving the environment, especially water contamination). Second, the principle of chlorophyll meter works 1. Two LED light source to emit two kinds of light, one is red light (peak wavelength 650nm), one is infrared (940nm), two kinds of light through the blade, hit the reception On, an optical signal into an analog signal, the analog signal is amplified by an amplifier, an analog / digital converter into a digital signal, digital signal processing microprocessor, SPAD value calculated and displayed on the screen. Calibration and Calculation 2. chlorophyll meter measurements during calibration, the head does not clip the sample, followed by two LED light, received light into an electrical signal, the ratio of the light intensity is used to calculate. After the sample was sandwiched between the indenter, again two LED light, transmitted through the light hit the blade on the receiver, is converted into an electrical signal, the intensity ratio of the transmitted light is calculated. Steps 1 and 2 values ??used to calculate the SPAD measurements, it means that the current relative chlorophyll content of the sample leaves clamped. Third, technical indicators 1. Nondestructive plant in vivo testing, does not affect the growth of plants. 2. Multi-parameter measurement speed quickly once: the simultaneous determination of plant chlorophyll, nitrogen, leaf temperature, leaf humidity, real-time display in one operation. 3. various parameters simultaneously display the same screen, at the same time storage. 4. Measurement data can be connected to a computer measurement data export, easy to plant nutrient management and analysis. 5. Data after an unexpected power failure has been saved in the mainframe is not lost. 6. View historical data, can order view, you can also jump to view. For historical data can be deleted one by one, you can delete all of a button. 7. The use of lithium battery-powered, with backlight function. 8. English one-button switch. 9. Measuring range: Chlorophyll: 0.0-99.9SPAD nitrogen content: 0.0-99.9mg / g foliage Humidity: 0.0-99.9RH% leaf temperature: -10-99.9 ℃ 10. Measurement area: 2mm * 2mm 11. Accuracy: Chlorophyll: ± within 1 SPAD units (at room temperature, SPAD values ??ranged from 0-50) nitrogen content: ± 5% foliar humidity: ± 5% leaf temperature: ± 0.5 ℃ 12. Repeatability: Chlorophyll: ± 0.3 SPAD unit within (SPAD value between 0-50) nitrogen content: ± 0.5 units foliar humidity: ± 0.5 units leaf temperature: ± 0.2 ℃ 13. Measuring the time interval: less than 3 seconds 14. Data storage capacity: 32KB 15. Power: 4.2V rechargeable lithium battery 16. Battery capacity: 2000mah 17. Weight: 200g 18. Work and storage environment: -10 ℃ ~ 50 ℃ ≤85% relative humidity Unit: Zhengzhou Teng Yu Instrument Co., Ltd. Tel: 0371-63763776 Mobile: 15515667674 13526865200 QQ: 2422448512 2307265375 E-mail: zztyyq@126.com Address: Zhengzhou City Fengle Hardware & Electrical City 28-1-12