At only 4.8-mm in diameter and 54-mm long, it’s about as long as a finger, and thinner than a pencil! I’m guessing their claims of being the world’s smallest are probably valid. The small size opens up additional possibilities for the location of piezometers such as small diameter stand pipes, or even attached to geosynthetics. The accuracy is reported to be as good or better than vibrating wire piezometers because it uses a micro optical mechanical system (MOMS). It sounds like it is a fiber optic system, so you would need a special fiber optic data logger. [Source: RoctestGroup. Image: RockTest]
