Scintillation Counter: A device used for the detection of radioactivity.

Secondary Emission: Electron emission that is the direct result of the impact of electrons against a surface.

Seeback Effect: The EMF produced in a circuit containing two contacting conductors of different metals having two junctions at different temperatures.

Sensitivity: Full scale output divided by the rated capacity of a given transducer / load cell.

Sensor: Element of measuring instrument or measuring chain that is directly or indirectly affected by the measurand.

Servo System: A electromechanical system which is used for positioning one element of a system in relation to another.

Shear: A deformation of an object in which parallel planes remain parallel but are shifted in a direction parallel to themselves.

Solenoid Valve: A valve actuated by a solenoid for controlling the flow of gases or liquid in pipes.

Span: Modules of the difference between the two limits of a normal range.

Solid: The state in which a substance has no tendency to flow under moderate stress.

Specifications: The range of values or numerical value which ties the performance of the product parameter.

Spectrum: (1) The entire range of wavelengths within which electromagnetic radiations occur. (2) A segment of wavelengths which has a special function or possesses special properties.

Stability: The ability of a measuring instrument to maintain constant metrological characteristics with time.

Standard: (1) Conforming to or constituting a standard of measurement or value. (2) a basis for comparison. (3) the ideal in terms of which something can be judged

Standard Deviation: A mathematical quantity used to characterize the dispersion of results.

Standard Operating Conditions, standard temperature and pressure (STP): Defined temperature and pressure to which all values are referenced for comparison.

Standard Pressure: The pressure exerted by a column of mercury exactly 760 mm high.

Standard Uncertainty: Uncertainty of the result of a measurement expressed as a standard deviation.

Strain: Deformation of a material body under the action of applied forces.

Straightness: The uniformity of direction throughout the extent of that feature.

Stress: Force that produces strain on a physical body.

Stroboscope: Scientific instrument that provides a flashing light synchronized with the periodic movement of an object.

Subcontractor: Organization that provides a product to the supplier.

Supplier: Organization that provides a product to a customer.

Surface Tension: The tendency of the surface of a liquid to contract.