Nason develops a series of temperature switches. Temperature switch TT is a bi-metal immersion temperature switch with a set point range of 40° to 300°F. Temperature switch TD is a snap disc design temperature switch with a set point range of 150° to 300°F. Temperature switch TM is a bellows design temperature switch with a set point range of 40° to 300°F. Temperature switch HT is a bellows high amp design temperature switch with a set point range of 40° to 300°F.