⚠️ Note: This item is final sale and not eligible for return.
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Enhance the functionality of your T855S thermostat with the R251S Indoor Temperature Sensor. This wired sensor, compatible with T755S, T855S, and T955S PRO1 thermostats, measures 1.75"W x 0.25"H x 0.25"D and operates on 24V power. Easily install this sensor to ensure precise indoor temperature readings for optimal comfort.
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![[Brand] R251S - Main view showing wired sensor for T855S](http://apcpart.com/cdn/shop/files/R251S-indoor-temperature-sensor-for-t855s-r251s-main.webp?v=1777116946&width=1946)
![[Brand] R251S - Detailed view of 24V power operations](http://apcpart.com/cdn/shop/files/R251S-indoor-temperature-sensor-for-t855s-r251s-closeup.webp?v=1777116947&width=1946)
![[Brand] R251S - Main view showing wired sensor for T855S](http://apcpart.com/cdn/shop/files/R251S-indoor-temperature-sensor-for-t855s-r251s-main.webp?v=1777116946&width=1445)
![[Brand] R251S - Detailed view of 24V power operations](http://apcpart.com/cdn/shop/files/R251S-indoor-temperature-sensor-for-t855s-r251s-closeup.webp?v=1777116947&width=1445)
