The Coefficient of Linear Thermal Expansion Tester model C0007, manufactured by IDM Instruments Pty. Ltd., is designed to measure the linear changes in refractories due to temperature variations. It features both analogue and optional digital gauges, with a specified accuracy of ±3%, and operates within a temperature range of -10°C to 55°C. The device can accommodate various materials and includes an optional thermostatic water bath for precise temperature control.