Environment monitoring is an important issue both to guarantee people health and for preserving materials. Ranges of the different quantities as well as the most important quantities to be monitored of course are related to the specific target, however the infrastructure required for the monitoring is similar in all cases requiring to measure for extended time intervals the quantities of interest in several places at the same time, to concentrate the values in an easy to access repository and to process the acquired data both in real time, for immediate intervention when required, and off-line for quality control and back-trace of any abnormal condition. These general constraints can be easily satisfied by using sensing nodes that connect to a concentrator device by using a wireless transmission to arrange what is usually referred to as a Wireless Sensor Network (WSN). The idea of using networks of sensors, which rely on wireless transmission, to arrange distributed measurement system is widely discussed in the measurement and computer science community since the development and diffusion of wireless components [1]. Unfortunately the WSN study is mainly developed in the field of wireless communications and computer networks so that most of the published papers concentrate on the design of wireless sensor networks to optimize data transmission instead of concentrating on accuracy and reliability of the measured quantities.