Most of Sensor Networks (SN) or sensor systems have a main target. 
This target is the instantaneous collecting of data or sensors readings 
every second (or fraction of seconds) and transferring / sending this 
data to a main computer or network server. The techniques used to 
collect and transfer network data to the main computer plays a vital 
role in goodness / robustness of that monitoring system. This research 
aims to design and implement a mobile unit to collect data that are 
read from a collection of sensors within an environmental monitoring 
system. A new concept of portable data acquisition unit and how it 
saves the sensors readings that are collected from network nodes is 
explained in details in this research. In this research, the technique for 
collecting and storing the sensors data is presented by using modern 
memory card (microSD).