Platinum RTD Sensor - PT100 - 3 Wire 1 meter long : ID 3290 : $11.95 : Adafruit Industries, Unique & fun DIY electronics and kits
I Will Teach You - RTD Sensor Connections Proper connections for all three types of RTD sensor (2-wire, 3-wire, and 4-wire) to a user configurable transmitter are shown in the following illustrations: