Constantan wire 34 SWG (0.23 mm) is a thin, high-quality wire made from an alloy of copper and nickel, known for its stable electrical resistance over a wide temperature range. With a diameter of just 0.23 mm, it is commonly used in applications where precise and consistent resistance is essential, such as in thermocouples (especially type T thermocouples), strain gauges, and precision resistors. The wire’s low-temperature coefficient means its resistance remains stable even with temperature fluctuations, making it ideal for temperature measurement and sensing applications. Its durable yet flexible nature allows it to be easily manipulated, wound, or used in compact designs. While it is often used in temperature-sensitive environments, constantan wire also finds applications in heating elements, electrical circuits, and welding. Its combination of stability, durability, and flexibility makes it a versatile choice for high-precision electronic and mechanical systems.