VAR meter is used to measure the reactive power. VAR meter also has four terminals. For the measurement of reactive power meter then splicing the same as the wattmeter. Constant measuring scaled in units of VAR or KVAR. VAR meter commercially available in two types: for measurement in single-phase systems (has 4 terminals) and to the measurement of three-phase systems (having 10 terminals).
For the measurement of the apparent power to do indirectly that by multiplying each voltage and current measurement results.
Figure 7.19-meter Typical VaR and kVAr-meter
Cosphi-meter
Power factor meter or commonly known as cosphi meter is an instrument to measure the power factor. These instruments are the same as the wattmeter has 4 terminals. Connection of this instrument is the same as the watt meter. The scale of measurement was made in accordance with the nature of the electrical load is inductive and capacitive. So there are two large-scale systems that scale to resistive load and scale for inductive loads or capacitive loads.
Figure 7.20 Construction Cosphimeter electrodynamic
Figure 7.21-meter Cosphi