Continuity Tester: It is used to check the continuity of current in different electrical ciruits.so with it you can check switches,lighting fixture and other devices for faults.It is operated by inbuilt battery.
Multi Tester: It has many extra features.It is used to check the AC (Alternating Current) and DC (Direct Current) current,voltage,continuity of electrical circuits etc. It available in market of two types
Analog Tester: It has a needle over a scale.In it there is more chances of human error in reading values.
Digital Tester :Digital meters use digits in place of a needles. it is more accurate than analog tester.and so measurement is very easy