Tachometer: An instrument for measuring rotational speed in revolutions per minute.

Temperature Coefficient: The change in measured value per unit change in temperature.

Temperature Compensation: The method of reducing the effect of a change in temperature on a force measuring instrument.

Terminal Linearity: Ratio of the actual error voltage in the output to the total input voltage.

Termination: The load connected to the output end of a circuit or transmission line.

Testing: A means of determining the capability of an item to meet specified requirements by subjecting the item to a set of physical, chemical, environmental or operation actions and conditions

Test Instrument: The device being compared with the calibration standard.

Test Line Limit: The pass or fail limit.

Theodolite: A optical instrument used for measuring horizontal or vertical angles.

Thermistor: A semiconductor device made of materials whose resistance varies as a function of temperature.

Tilt Graticule: A graduate reticule used in Collimators for measuring vertical and horizontal tilt, or angular deviation.

Time: Measurement of duration.

Torque: Cause of rotary motion. It is equal to the applied force multiplied by the distance from the center of rotation.

Torr: 1/760 of and atmosphere.

Ambient Temperature: Temperature of the air in the immediate vicinity.

Total quality management: Management approach of an organization, centered on quality based on the participation of its member and aiming at long-term success through customer satisfaction and benefits of all members of the organization and to society.

Traceability: Ability to trace the history, application, or location of an entity by means of recorded identification

Transducer: A device that provides an output quantity having a determined relationship to the force.

Transfer: Standard used as in intermediary to compare standards.

True Mass: Mass as measured in a vacuum.

Atmospheric Pressure: The force exerted on a unit area by the weight of the atmosphere.

Auditee: The organization being audited