The Environmental Chamber for mechanical testing is designed for carrying out tests under extreme thermal conditions, with an operating range from -70C to +300C.The chamber is equipped with a digital microprocessor - based temperature controller, a liquid nitrogen cooling system with solenoid valve, and a fully insulated structure to ensure temperature uniformity and test repetability. Temperature homogeneity on the sample is ensured by forced air circulation trough a horizontal fan, while a double safety system provides continuous protection against over-and under- temperature conditions, with automatic shudown of heating elements and fan when door is opened.