This specification covers pyrometric requirements for equipment used for the thermal processing of metallic materials. Specifically, it covers temperature sensors, instrumentation, thermal processing equipment, correction factors and instrument offsets, system accuracy tests, and temperature uniformity surveys. These are necessary to ensure that parts or raw materials are heat treated in accordance with the applicable specification(s). AMS2750H results from a Two-Year Review and update of this specification with changes to Definitions (see 2.4.21, 2.4.25, 2.4.36, 2.4.47, and 2.4.84); General Sensor Requirements (see Table 3); Sensor Calibration (see 3.1.4.6 and Table 5); SAT and TUS Sensor Reuse (see 3.1.7.4 and 3.1.7.5); Base Metal Load Sensors (see 3.1.10.3); General Instrumentation Requirements (see 3.2.1.4.1, 3.2.1.5, and Table 7); Control, Recording, and Over-Temperature Instruments (see 3.2.3.4, 3.2.3.5, 3.2.3.16, and 3.2.3.18); Instrumentation Calibration Results and Records (see 3.2.5.1); General Instrument Correction and Modification Offset Requirements (see 3.2.6.1.2 and 3.2.6.1.8); Thermal Processing Equipment (see 3.3.7); General SAT Requirements (see Table 11, Table 12, and 3.4.1.2.1); Performing an SAT (see 3.4.2.2); Alternate SAT Frequency (see 3.4.8.3); SAT Waiver (see 3.4.9.6.3); SAT Difference Pass/Fail Requirements (see 3.4.10.4); Comparison SAT (see 3.4.11.1.e); Parts furnace class, instrument type, and TUS internal (see Table 15); Raw material furnace class, instrument type, and TUS internal (see Table 16); Initial TUS Temperatures (see 3.5.2.4); TUS Requirements for Batch Furnaces, Salt Baths, Controlled Temperature Liquid Baths, and Fluidized Bed Furnaces (Excluding Controlled Temperature Quench Baths) (see Table 17); TUS Data Collection (see 3.5.10.1 and 3.5.10.2); Relocation of Hot or Cold Recording Sensors for Type A and C Instrumentation (see 3.5.15.2); Radiation Survey (see 3.5.17, 3.5.17.1, and 3.5.17.2); TUS Interval Deviations (see 3.5.18); Rounding (see 3.8); and Quality Assurance Provisions (see 4.2, 4.4, and Table 22). Deleted Zener Voltage Reference (was 3.5.87).