The oceans cover almost 75% of the planet and affect the lives of every plant and animal on earth. With global climate changing rapidly, the importance of studying the oceans has increased dramatically since they play a crucial role in global climate regulation. A Conductivity, Temperature, Depth (CTD) sensor is the primary tool for determining the physical properties of sea water. This project will present a conductivity sensor based on a 7-electrode cell, and a temperature sensor based on a platinum resistor bridge. Whilst, an impendence measurement system will also be present for collecting and storing the data form the CT sensor.