When you are looking at the 6700 Series thermostat from Sensata Technology there are three main features you want to look at.
First is the thermostat Normally Open (NO) or Normally Closed (NC)? When you look at the part number breakdown at the bottom of the page you can see that the third digit of the part number will indicate this. If that digit is an "F" than it is a Fan or Normally Open and the circuit will close once it reached the Switching Temperature. If that digit is an "L" that it is a Limit or Normally Closed and the circuit with open once it reaches the Switching Temperature.
Switching Temperature is listed in the part number in Degrees Celsius and will be the temperature that the thermostat would change from normally open to closed or normally closed to open.
Reset Temperature is the temperature the thermostat would reset back to its Normal state.
For this example I will use part 67F050 which is a normally open thermostat. If you were using this to control a fan your fan would remain off until the temperature reached 50°C (122°F) and then would stay on until you reached the reset temperature of 30°C (86°F) when the thermostat would open again.