Jitter: Small, rapid variations in a waveform due to mechanical disturbances.

Joule: A unit of electrical energy equal to the work done when a current of one ampere passes through a resistance of one ohm for one second.

Kelvin Temperature Scale: The absolute temperature scale in the CGS system. Kelvin is equal to degrees Celsius plus 273.15.

Kilogram: One thousand grams.

Kinetic Energy: Energy due to motion.

Level: Perpendicular to the force of gravity.

LIMS (Laboratory Information Management System): A system that manages operations of a testing laboratory.

Linearity: The degree to which performance or response approaches the condition of being linear.

Linear Meter: The deflection of the pointer is proportional to the quantity measured.

Load Cell: A type of force transducer designed primarily for the measurement of load or weight.

Loading Effects: An error of measurement resulting in a change of the system under test caused by insertion of the test instrument.

Lumen: Unit of luminous flux.