A) Precision measurements of electrical quantities: 1. Passive values: resistance capacitance inductance dissipation factor High voltage trahsfer coefficient High current transfer coefficient on DC and wide frequency range with uncertainty from 100 to 0.1 ppm. 2. Active values: DC voltage and current AC voltage and current B. Nonelectrical quantities: 1.Temperature 2.Salinity, 3. Solution concentration 4. preasure, 5. humidity, and other meteorilogic parameters. C. Mechanic quantities 1. Angle displacement 2. lengh displacement