This is a K type Thermocouple (Temperature sensor) which is very popular for 3D printers such as Ultimaker and Makerbot. You can hardly damage them or mishandle them. You just need an additional IC (Like an AD595) for interpeting the data from this sensor.

SPECIFICATION

• Measure Temperature:0-800 °C 
• Accuracy: ±2 °C
• Cable Color Code: Red (+), Blue(-)
• Calbe Length: 125mm (4.92")
• Material: Stainless
• Dimensions: 3mm X 25mm (0.11x0.98")

DOCUMENTS

• Thermocouple Principle Wiki

SHIPPING LIST

• K Type Thermocouple     x1