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 interpreting the data from this sensor.

• Measure Temperature:0-800°C
• Accuracy: ±2°C
• Cable Color Code: Red (+), Blue(-)
• Cable Length: 125 mm (4.92 inch)
• Material: Stainless
• Dimensions: 3 mm X 25 mm (0.11 x 0.98 inch)

Documents:

• Thermocouple Principle Wiki
  

Warranty: 90 days

• Warranty will not apply if Product fails or is damaged after delivery to you due to accident, abuse or misuse.

Package Includes:

• 1 x K Type Thermocouple