Inertial tracking use data from accelerometers and gyroscopes. The company makes sensor hubs that manage accelerometers, gyroscopes, inertial measurement units and magnetometers. Monitoring is typically performed with thermocouple sensors, vibration accelerometers, multimeters and data loggers. This is accomplished by combining readings from accelerometers and gyroscopes mounted in the device. Each unit contains three solid-state gyroscopes and three accelerometers. Many types of sensors are used, including strain transducers, accelerometers, tiltmeters, and GPS. Each MIMU is a combination of three accelerometers and three ring-laser gyroscopes. The system would be a north seeking stable platform controlled by gyroscopes and accelerometers. Anemometers, accelerometers, inclinometers, temperature sensors are all used for the instrumentation network. Examples include pressure sensors, accelerometers, and microengines. The most common varieties of altimeter use accelerometers, barometric sensors or a combination of both. Pendulums are also used in scientific instruments such as accelerometers and seismometers. Linear accelerometers measure non-gravitational accelerations of the vehicle. The yaw rate can be measured with accelerometers in the vertical axis. NVH include microphones, accelerometers and force gauges, or load cells.