Spectrum Instruments, Inc. specializes in developing high-performance GPS-based time and frequency products. They offer standard and custom-designed products for precise time or frequency control in various applications such as wireless networks, data timing, and scientific instrumentation. Spectrum's products include GPS-disciplined oscillators, rack-mount products, and intelligent reference instruments. They provide technical services for product development and have a collaborative network of engineers. Spectrum Instruments focuses on customer partnerships, manufacturing in-house at their facility in San Dimas, California, and maintaining long-term customer relationships.