1.1 This specification contains reference tables (Tables?8 to 25) that give temperature-electromotive force (emf) relationships for Types B, E, J, K, N, R, S, T, and C thermocouples.2 These are the thermocouple types most commonly used in industry. The tables contain all of the temperature-emf data currently available for the thermocouple types covered by this standard and may include data outside of the recommended upper temperature limit of an included thermocouple type. 1.2 In addition, the specification includes standard and special tolerances on initial values of emf versus temperature for thermocouples (Table?1), thermocouple extension wires (Table?2), and compensating extension wires for thermocouples (Table?3). Users should note that the stated tolerances apply only to the temperature ranges specified for the thermocouple types as given in Tables?1, 2, and 3, and do not apply to the temperature ranges covered in Tables?8 to 25. 1.3 Tables 4 and 5 provide insulation color coding for thermocouple and thermocouple extension wires as customarily used in the United States. 1.4 Recommendations regarding upper temperature limits for the thermocouple types referred to in 1.1 are provided in Table?6. 1.5 Tables?26 to 45 give temperature-emf data for single-leg thermoelements referenced to platinum (NIST Pt-6