Measuring instrument. Analog measuring instruments. An instrument with the movable coil. Extension of the instrument’s measuring field with movable coil. An instrument with movable iron. Electrodynamics instrument. Extension of the measuring range of the voltmeter and ammeter. Oscilloscopes. Time base. Trigger time base. X-Y mode. Multichannel oscilloscopes. Digital oscilloscopes. Measuring transformers. Measuring voltage transformers. Current measuring transformers. Electricity meters. Induction meter of electricity. Electronic meter of electricity. Sampling timer. Measuring bridges. DC measuring bridges. Wheatstone bridge. Kelvin bridge. Alternating measuring bridges. Unbalanced measuring bridges. Measuring bridges with more sources. Measuring compensators. DC measuring compensators. Alternating measuring compensators. General characteristics of measuring instruments. Static property. Sensitivity. Linearity. Resolution. Measuring range. Scale/watch hand/ Display. Input/Output Impedance. Accuracy. Stability. Normal/Limiting/Referent conditions. Tags. Dynamic properties. Measuring of electrical quantities. Measuring nonelectrical quantities. Measuring insecurity. Measuring errors. Rough mistakes. Systematic mistakes. Random mistakes. Measuring uncertainty. Standard measuring uncertainty. Type ‘’A’’. Type ‘’B’’. Combined measuring uncertainty. Extended measuring uncertainty. Measuring information. Quality of the measuring information.