Model	Function difference
TPY-IV	1. Test N, P, K, Organic Matter. 2. with storage function. 3. built-in the amount of nutrients needed for growth of 73 kinds of crops, can provide guidance for fertilizing amount according to needs. 4. Without printing function.
TPY-6A	1. Test N,P,K, organic matter, soil pH, soil salinity. 2. with storage function. 3. built-in the amount of nutrients needed for growth of 73 kinds of crops, can provide guidance for fertilizing amount according to needs. 4. with printing function.
TPY-6PC	1. Test N,P,K, organic matter, soil pH, soil salinity. 2. with storage function. 3. built-in the amount of nutrients needed for growth of 73 kinds of crops, can provide guidance for fertilizing amount according to needs. 4. with printing function. 5. with a software, be able to connect to computer for data storage.
TPY-7PC	1. Test N,P,K, organic matter, soil pH, soil salinity. 2. with storage function. 3. built-in the amount of nutrients needed for growth of 73 kinds of crops, can provide guidance for fertilizing amount according to needs. 4. with printing function. 5. with a software, be able to connect to computer for data storage. 6. Add one more parameter: soil moisture

Product Paramenters

1. Soil Nutrient technical parameter
Stability	Absorbency of light drift＜0.003
Repeatability	Absorbency of light＜0.005
Linearity errors	red light for Copper sulfate, and blue light forpotassium bichromate＜3.0%
Sensitivity	Red light≥4.5x10-5, Blue light≥3.17*10-3
Wavelength range	Red light 620±5nm, Blue light440±5nm
Anti-Knocking performance	Qualified
2. pH technical parameter
Testing range	1-14
Error	±0.1
3. Salinity technical parameter
Testing range	0.01% -1.00%
Error	±5%
4. Soil moisture technical parameter (TPY-7PC)
Moisture unit	% (m³/m³)
Accuracy	±2%
Moisture content rate testing range	0-100%
5. Instrument technical parameter
Display mode	LCD display
Interface	USB
Working environment	0~40℃ 35~85%RH
Alternating current (AC)	220V-240V, 50Hz, adapter: 12V/3A
Size	2×28×11cm

Contents of agricultural instruments