What is the Remote temperature sensor for TC900 series used for?

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The RS-03 remote sensor can be used in place of the existing built-in temperature sensor of the TC900 Series thermostats*. It has the same 10 kΩ NTC (3950) element encapsulated in a plastic bulb housing that measures approximately Ø6 x 25 mm and is supplied with 3 m cable (2-wire), finished in all white. The RS-03 sensors are only available in multi-packs of 10 pieces.
*RS-03 works with deluxe models only, i.e. models with an ‘S’ included in the model number (‘DLSA’, ‘DLMSA’, ‘FMSA’, etc.).

RS-03 remote sensor