There are laboratory based methodsto measure soil pH and mV which are expensive and labour intensive as the soil samples are collected and bring manually in Laboratory to calculate the soil pH.Hereupon, there is a need to develop a machine mounted pH monitoring system which will help in mechanization of field operation by providing real time and online values of soil pH and mV, thus helping the researchers and farmers to start precision farming in the area.To achieve this,a tractor operated pH monitoring system was developed consisting of Bund former, pH meter with data logger and GPSS (Global Positioning Satellite System) for the measurement of different parameters such as soil pH, latitude, longitude and milli volts in the field.A tractor operated bund former for mounting of pH meter was selected due to safely fitting of probe on it and also had enough space for placing the pH meter and Global Positioning System (GPS).The probe/electrode of pH meter was fitted on the blade of bund former in the contact of raising soil to sense and send the signal continuously to pH meter.The developed system was evaluated in the field to measure the soil pH and mV along with geo-referenced locations.On an average soil pH of selected field was measured 6.55 with coefficient of variation (CV) 7.0%.Average soilmV was 40.71 having coefficient of variation (CV) 56.1.The modeldeveloped between pH and mV showed that there was a good co-relation between soil pH and mV having R2=0.89 indicating that soil pH was basically the reduction oxidation potential of soil.