Spec Sensors - Spec Sensors was founded to provide the gas sensing expertise that enables the Internet of Things movement and make gas sensing a part of our everyday lives. Based in California near Silicon Valley, we combine our extensive experience in reliable and time tested gas sensing technologies with novel manufacturing techniques to produce gas sensors that are small enough to go anywhere while maintaining the high performance that is critical to delivering useful information. We take pride in both our long history and gas detection and our deep involvement in cutting edge technology.