Temperature sensor help

I got a starter kit and it comes with some sensors that I don't know what are they for. I found this one and I'm pretty sure that it's a temperature sensor (I measured the resistance with a multimeter and it changes when it's cold or warm or hot). Using the arduino and the serial, I can get some values but I can't figure a way to convert that values to temperature.

Here's the sensor. The numbers that are write are 103.

Thanks in advance

Google "arduino thermistor tutorial"

I did that, but none of the equations to convert the values to the temperatures are correct.

What is the basis for the claim that the equations you found are not correct?
Please read "how to use this forum" on the top of the forum.

I decided to change my wires and resistances and now it's working just fine. Thanks for the tips and I'm sorry for any troubble caused.