In the SANY project, the French company SolData has developed a wireless monitoring system for monitoring of the structural stability of the buildings. This worked really well and they commercialized the results soon after the project end in 2009 or 2010.

A concise description of the original system is available in https://www.researchgate.net/publication/259148140_SANY_an_open_service_architecture_for_sensor_networks

Today they already have 5 years of operative use behind them, so the product is likely to be really polished and usable out of the box. If you are looking for a quality product for structural stability monitoring, this is likely to be a good match.

More info can be easily found by googling the "soldata micron".

I hope this helps.

(I'm not affiliated with SolData, I just led the SANY project)

Book SANY: An Open Service Architecture for Sensor Networks

AMny Thanks, I just Want to know some intersting sensors for health structure monitoring , in order to give as a project for master students : design of wsn for old structure monitoring.

Strain gauge,  clip gauge, temperature. These sensors can be coupled with xbee modules. You might need an amplifier circuit. Strain gauges help you get the current stress pattern, clip gauge aids in monitoring crack patterns. Temperature sensor gives you information about expansion due to variation in climatic conditions. You might have to fabricate custom amplifiers if you are using strain gauges or clip gauges. Building WSN with XBee modules are very eay and cheap.

Good Idea about sensors I have already opted fro Arduino Mega as controller and Xbee module fro wireless transmission, I should add a conditionning circuit for some of there analog sensors. Many thanks .