current

potential difference

capacitance

resistance

D.C. current and D.C. voltage

D.C. and A.C. current

A.C. voltage

A.C. current

Wattmeter and power factor meter

Frequency meter and tong tester

Phase sequence meter and energy meter

Ohm meter and megger

Frequency meter and P.F. meter

Voltmeter and frequency meter

Voltmeter and power factor meter

Wattmeter and voltmeter

avoid overloading the resistor when measuring its voltage

avoid inaccuracy when the temperature changes

keep the measurement error small due to the internal consumption (voltage drop) of the meter

prevent the meter from overloading