Founded in 1990 by a small group of scientists specializing in physics, seismology, electronics, and seismic instrumentation, PMD Scientific, LLC. manufactures a full range of seismic instru-mentation, including standard and custom-built seismometers, force-balanced accelerometers, and high-resolution seismic and strong-motion data loggers and digitizers. Our products operate successfully on six continents in more than twenty countries.
PMD has also been the recipient of numerous Small Business Innovation Research grants, awarded by the National Science Foundation, the National Oceanic & Atmospheric Administration, and the Depart-ment of Energy. The company is located in Central Connecticut half way between New York and Boston.

PMD seismometers are based on proprietary electrochemical technology, and equipped with unique features which are unavai-lable in traditional electromechanical sensors. The company's electrochemical seismic sensors are extremely robust, and designed to require minimal maintenance, no mass locks for handling and transportation, and no mass centering over the full operating temperature range. Moreover, they can stay fully functional at significant installation tilts. These characteristics - along with the very low power consumption - make our seismo-meters especially well-suited for applications on the ocean floor.

PMD has never shied away from challenges or special tasks, and over the years we have successfully developed and produced several unique seismic sensors:

• A triaxial  isotropic low noise ultra-low power underwater seismometer which can operate normally in any random orientation
• A true rotational high resolution seismometer which is entirely insensitive to translational motion. The second generation rotational seismometer currently in production has significantly broader passband and extremely high resolution, and is equipped with force-balancing magneto-hydrodynamic feedback 
• A vibration sensor for the beam focusing system of the International Linear Collider and other particle accelerators. These sensors can operate in extremely strong magnetic fields of up to six Tesla.