The modular MESSKO TRASY2 temperature measuring system is suited for measuring oil and winding temperatures (thermal image) in medium or large distribution and power transformers, reactors or similar applications. The pointer thermometers are systems that function without power with freely adjustable micro-switches. The measured values are recorded by a fluid-filled temperature sensor and transmitted to the display by a spiral spring. Additional modules enable the thermal image, an additional PT100 sensor system and remote transmission.