Here you Can Learn about the Multimeter and its types

1. Multimeter

2.  A multimeter or a multitester, also known as
a VOM (volt-ohm-milliammeter), is
an electronic measuring instrument that combines
several measurement functions in one unit. A
typical multimeter can measure voltage, current,
and resistance.
 It is also used to test continutiy between to 2
Points to verify if there is any breaks in circuits or
line.