Measurements: soil moisture and humidity, soil salinity conductivity, soil acidity PH meter, soil temperature, soil N content of nitrogen, phosphorus P content of soil, soil K content, soil organic matter.
In order to facilitate the field without AC field operations, STFW-7 soil moisture nutrient salt temperature meter in the instrument equipped with a high quality rechargeable batteries, fully charged for 12 hours after a more stable DC power supply. Eliminates the worry-free electricity. In the photoelectric colorimetric analysis section of the apparatus according to national patent 90214274 • 7 set the log output, the logarithmic curve in the formation of local ad hoc direct adjustment knob can be removed from the spectrophotometer used in general the photoelectric colorimeter analysis to draw the graph of trouble; can be measured directly from the machine and read the concentration of the substance. The instrument can be used in agriculture, forestry, animal husbandry, industry, health care, education and other aspects of conventional test colorimetric, PH value , conductivity, temperature measurement, but also for the field of soil nutrients, water velocity measured with a multi-purpose, convenient and intuitive. Is related to the laboratory, Institute of Agricultural Science, Soil and Fertilizer Station, and grain, cotton, vegetables, fruit, flowers, and other plant equipment of choice for farmers.
 
Features:
△ display: Host STFW-7 digital display measurement results
△ photoelectric colorimeter wavelength range: 410nm-750nm
△ brand: SINTEK
△ Test Sensitivity: ± 0.01
△ test accuracy: the soil available P: ± 1ppm;
Soil available N: ± 5ppm;
Soil moisture: ± 2%
Soil available K: ± 5ppm;
Soil pH (PH value): ± 0.02PH;
                     Soil conductivity (salt): (10μs-100μs; 2ms-10ms), accuracy: ± 0.5%
       soil moisture sensor regions: around the central probe is 6cm long 3cm diameter cylinder inside.
    TDR-3-type soil moisture sensor:
        probe 4 × 6cm (L)
        sealing material is ABS engineering plastics
        probe made of stainless steel
    Temperature: ± 0.2 ℃ (range: +2 ℃ - +50 ℃);
    environment: Temperature +5 ℃ - +40 ℃; humidity ≤ 85% RH
    rotary colorimetric slot, which can put six cuvettes
    Power: 20W
    AC power supply: 220V ± 10%
    DC: 12V/1.2AH × 2 rechargeable batteries
    volume; 335mm × 226mm × 175mm
     Weight: 7 kg