First, the performance characteristics of a large-screen LCD Chinese display, man-machine dialogue, automatic boot operation, and built-in expert fertilization system. 2, cross, straight [lithium battery (optional)] dual-use, built-in high-capacity battery, can work for four hours in a row in the absence of an external power supply. 3, built-in thermal printer, you can print out the detection date, the detection time, the customer name, soil type, crop varieties, soil content, fertilizer type, quantity and other fertilizer-related information, content rich detail. 4, according to local conditions set crop varieties, crop production, fertilizer varieties, and automatically calculates the amount of fertilizer. 5, can store 1000 groups of test data (test sample time, place, all kinds of nutrients results) and other relevant information stored, the testing process has a look back at the function, the data can be called up to view. 6, high brightness LED lamp as the light source, the silicon semiconductor as a signal receiving system, long life of 100,000 hours. 7, job stability than six times the national standard JJG179-90 indicators, repeatability of grating spectrophotometer indicators. 8, fertilization expert system software A, the memory more than 70 kinds of crops, fertilizer recommendations of experts, real-time, on-site, add, add, update, crop species, abundance and deficiency index, fertilizer, etc., for crops without restriction. B, according to crop varieties, soil content, the content of fertilizers, fertilizer prices, fertilizer can automatically recommend the best solution to save more than 1000, and unlimited save, print fertilizer recommendations table. C, can print out the detection date, the detection time, customer name, number of soil, soil type, crop varieties, soil content, fertilizer varieties, fertilizer prices, the number of related information, such as fertilizer, rich and detailed. 9, through GPRS module, the data wirelessly to your phone and computer network (optional). Second, the test items can be detected in soil, plants, chemical fertilizers, bio-fertilizers and other samples of the available nitrogen, available phosphorus, available potassium, plants of total nitrogen, total phosphorus, total potassium, organic matter content, soil pH, soil salinity . Third, the technical parameters 1, Stability: A value (absorbance) in three minutes less than 0.003 2 drift, Repeatability: A value (absorbance) is less than 0.005 3, the linearity error: less than 3.0% 4. Sensitivity: red ≥4.5 × 10 -5; blue ≥3.17 × 10-3 5, wavelength range: red 620 ± 2nm; blue 440 ± 2nm; green 520 ± 2nm 6, the moisture content of the test range: A, humidity range: 0 ~ 100% B, measured Accuracy: ± 3% 7, PH value (pH) Measurement parameters: A, test range: 1 ~ 14 B, error: ± 0.1 8, salt (conductance) measurement technology parameters: A, test range: 0.01 to 1.00 % B, the relative error: ± 5% 9, the instrument used in power: A, AC: 180V ~ 240V, 50 Hz B, DC: 12V, 5W (car) C, lithium battery: 12V, 5000MA 10, NPK combined dip mention: 3 minutes to complete soil nitrogen, phosphorus and potassium, while leaching 11, the test speed: measuring a soil sample (N, P, K) ≤30 minutes while five soil samples measured ≤50 minutes (including pre-treatment time) 12, Instrument Size: 320 × 00 × 120mm 13, shock resistance: Qualified four, easy to operate Tachometer set drug, device, instrument as a whole, easy to carry, the equivalent of a small laboratory, easy on-site testing, mobile service . Open bottle of finished pharmaceutical that is used to ensure that the test speed and quick. Low cost, a measure of nutrients (N, P, K) costs only $ 2. Fifth, the instrument configuration (aluminum lockbox two: 490 × 305 × 165mm, net weight 10Kg) instrument case: Host, electronic scales, electrodes, cuvettes, experts fertilization software, power lines. Medicine chest: flask, flask, funnel, cylinder, filter paper, aluminum box, bottle, medicines 1 sets.