Koolance SEN-AP002P Temperature Sensor, Flat, 50K Ohm (Older Version) NOTE: This sensor will only work with Koolance products which use 50K Ohm @25&deg;C sensors (introduced before 2011). Flat thermistor temperature sensor compatible with Koolance multi-sensor systems. Wire length = 30" (76cm). This type of thermistor is more fragile than metal-encased plug versions. The sensor may burn out if placed in direct contact with a high heat source.