High-temperature furnaces and high-low temperature chambers are essential environmental testing accessories widely used with electronic universal testing machines. They provide a controllable temperature environment to simulate high-temperature, low-temperature or alternating temperature conditions, enabling material tensile, compression, bending and other mechanical performance tests under real working temperatures. By precisely adjusting temperature and maintaining stability, these devices can accurately measure changes in material strength, ductility and deformation at different temperatures, providing reliable test data for material research, quality inspection and product certification in accordance with international testing standards.