We have designed and manufactured transducers and sensors as well as the interface electronic circuitry for earth science applications for clients worldwide. Some of these devices in geothermal energy applications have beeen required to pass tests under high temperature and high pressure and be able to withstand high shocks. All transducers convert one form of energy to another while controlled and read via an interface electronic circuit by a computing processor. In some cases, such as monitoring of seismic vibrations of earth formations, all three components can be on a single board the size of a large postage stamp. Design, manufacture,quality control and test phases are carried out usually with our alliance partners.