Installed under spark plug or head bolt, CHT-FS Series Cylinder Head Temperature Sensor monitors engine performance and critical over-temperature conditions. Flexible stem design allows for installation in high-temperature areas with limited clearance. Available for 10, 12, 14, or 18 mm OD bolts/spark plugs, Type K thermocouple features measuring range of -40 to +1,000°C. Typical applications include UAVs, light aircraft, power generators, and automotive engine R&D.