5pcs 4M Waterproof Temperature Sensor Probe, Stainless Steel 10k 3950 NTC Thermistor Probe, Digital Temperature Transimitter Extension Cable，CPU Temperature Sensor

I needed a remote temperature sensor for my Trane thermostat. Trane has a remote sensor that costs about $40. Besides the cost I would also have another box hanging on the wall which I wanted to avoid. This sensor works quite well giving accurate readings and it is very small. I will have to paint the cable so it's less visible but it does exactly what I needed.