It can test ammonium nitrogen、available phosphorus、available K、alkali hydrolyzable nitrogen , and so on ; LCD display ; AC/DC is available ; Touching button ; Wheel-type selecting filter .
IV . Technical Index :
1. Resolution : 0.001 --- 9999 .
2. Repeatability : ≤ 0.5 ( testing in potassium dichromate standard solution ) .
3. Instrument Stability : ≤ 0.5 ( transmittance measurement ) .
4. Power Consumption : ≤ 5W .
5. Linear error : Absorbance range : 0.1～0.3，linear error ≤±6%；Absorbance : 0.3～0.6 , linear error : ≤±4% ; Absorbance :0.6～0.8 , linear error : ≤±5% ( testing in potassium dichromate standard solution for blue light or copper sulfate solution for red light ) .
6. Testing speed : ≤ 1 hour for testing one soil sample (N、P、K) .
VI . Advantages for the Instrument :
1. Full Functions : It can test N、P、K in the soil and fertilizer ; Organic matter in the soil and fertilizer ; Soil monisture ; Middle、trace elements such as boron, manganese, iron, copper, calcium, magnesium, sulfur, silicon, zinc and so on ; Total nitrogen .
2. Components is complete : It include reagents/pharmacy、appliance、instruments 、just like a small Lab, portable to carry . It’s suitable to test soil fertilizer and distinguish fertilizer for agriculture service .
3. Operation is easy and fast : it can finish extractant by our exclusively developed joint extractant ( patent ) within 5 minutes . Pharmacy is compliant .
4. Performance is reliable : working stability is better than Chinese standard JJG179-90 for 6 times , Repeatability can reach to Raster-type spectrophotometer standard .