Siemens 540-739 SKU: 540-739 $71.94 $189.31 (0)No Reviews yet Quantity -+ Add to Shopping Cart Limited Factory Stock Details Duct Point Temperature Sensor, 18" Rigid Probe, 10k Ohm NTC Thermistor, Powered from TEC Controller via RJ-11 Connection, 2×4" Electrical Box, 5-Year ... Data Sheet Installation Instructions DetailsData SheetInstallation Instructions Back Duct Point Temperature Sensor, 18" Rigid Probe, 10k Ohm NTC Thermistor, Powered from TEC Controller via RJ-11 Connection, 2×4" Electrical Box, 5-Year Warranty (for use with TEC Only) ( Minimum Siemens order quantity of $250.) Back Back Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review