It allows for higher voltages to be safely measured
It improves the resolution of the readings
It decreases the loading on circuits being measured✓Bonne réponse
Explication
A voltmeter is connected in parallel with the point being measured, so it forms a divider with the source impedance and draws current from the circuit. Making its input impedance high keeps that current negligible so the reading reflects the voltage that was there before the meter was attached.