Soil PH meter， features: 1， the probe body with telephone cord connection， can be pulled to about one meter， read more convenient. 2， the body belt clip and probe socket， easy to carry and flow measurement technician.

Soil pH also known as "soil reaction." It is acid-base reaction of soil solution. Depending on the concentration of hydrogen ions in the soil solution to pH values. the pH of the solution is equal to 7 for neutral solution; pH value of less than 7， the reaction is acidic; pH greater than 7 is alkaline reaction. Soil pH can generally be divided into the following levels:

Soil pH on soil fertility and plant growth is large， northwest China， north many soil pH big， small Southern Red pH value. So it can grow and adapt to soil pH and plant crops. Such as acid red soil area planted hi tea， and alfalfa strong alkali ability. The effectiveness of soil pH on nutrient is also great， such as large neutral soil phosphorus validity; alkaline soil trace elements (manganese， copper， zinc， etc.) poor effectiveness. In agricultural production should be noted that soil pH， and actively take measures to adjust.

Soil pH effectiveness of plant nutrients， soil structural and crop have a great relationship. First， the soil nutrient organic state by soil microbial activity to participate in， to make it into nutrients available for plant uptake state， decomposition of organic matter and microorganisms involved in the majority of growth in the near neutral environment， soil nutrients and effective of generally near neutral reaction is the best. Secondly， the soil pH on soil structure is also affected. Acidic soils， the hydrogen ion concentration， easy to colloidal calcium ion substitution leaching out， it is easy to acidic soil compaction. The alkaline soil contains a lot of exchangeable sodium ions and hydroxide ions， so that soil particles dispersed， dry compaction， resulting in poor structural earth. In addition， soil pH and plant growth also has a very close relationship. In nature， some plants on soil pH conditions of strict requirements， they can only in a particular pH range of growth， these plants can play indication that the soil pH， so called indicator plants. Such as azalea grow only in acidic soils， soil acidity called indicator plants; cedar calcareous soil indicator plants， while S. salsa is alkaline indicator plants. Different cultivated plants have different optimum growth pH range (see table below)， know their respective optimal growth range， we can according to local conditions based on soil pH， choose the right crops; or according to crop， adjust the soil pH to the proper range.