AI-TEK Instruments, LLC, formerly known as Airpax, is an American company headquartered in Cheshire, Connecticut, specializing in the design and manufacture of electronic and electromechanical products for protection, detection, and control applications. With decades of heritage dating back to its Airpax origins, the company focuses on delivering reliable sensor and instrumentation technologies for demanding industrial environments. Its core product portfolio includes variable reluctance speed sensors, magnetoresistive speed sensors, passive and active sensors, tachometers, speed measurement systems, controllers, positioners, modules, and connection cables. These products are engineered to operate consistently under extreme temperatures, vibration, shock, humidity, and corrosive conditions, making them ideal for industrial, automotive, aerospace, and hazardous-area applications. Specific product series encompass high-temperature sensors, low-speed and zero-speed sensors, and explosion-proof sensors, all tailored to meet stringent safety and performance requirements. AI-TEK holds a leading position as a specialty supplier of tachometric and speed sensing solutions, trusted by global OEMs in power generation, oil and gas, transportation, and manufacturing. The company emphasizes understanding customer needs and continuous technological advancement, offering competitive pricing without compromising quality or service. Its variable reluctance technology has been a cornerstone of control and protection circuits for decades, featuring no moving wear parts and exceptional longevity. While not a broad-line semiconductor vendor, AI-TEK's deep expertise in magnetic measurement principles and harsh-environment design sets it apart in the niche electronic components market. The company continues to innovate, expanding into smart sensor modules to address evolving digital industry demands.