Datasheet

Size: 24 gauge, 1 meter long (you can cut it down if desired)

Price: $10 at the adafruit store

Temperature range: -100°C to 500°C / -150 to 900°F (After this the glass overbraiding may be damaged)

Output range: -6 to +20mV

Precision: +-2°C

Requires an amplifier such as MAX31855

Interface: MAX6675 (discontinued) MAX31855, or AD595 (analog)

K Thermocouple Datasheet

MAX6675 Datasheet

MAX31855 Datasheet