Siemens 540-520A ROOM TEMPERATURE SENSOR, FLUSH MOUNT, 10 K OHM, 55 TO 95 DEG F, BEIGESiemens 540 520A Room Temperature Sensor, Flush Mount, 10 K ohm, 55 to 95 deg F, BeigeThe Flush Mount Room Temperature Sensor is a 10K ohm self contained, non intrusive, and tamper resistant unit. The sensor connects to the RJ 11 port of the controller via a pre terminated cable. This unit has a beige plastic cover. Additional Information Measuring range, temperature1335 C Sensing element10K ohm NTC Thermistor Operating voltagePowered from TEC