Aim :- To study about the Line Tester and its usage.

Materials required :- A line tester, 230 V Ac outlet


An electrical neon tester is a device used for quickly checking whether a conductor is carrying electric current.


The device is having the shape of a screw driver.



The metallic tip is used for touching the conductor to be checked.

It connects to a high value resistor and a Neon bulb.

The spring connector keeps the bulb in position and connects to the metallic screw positioned in the back of the handle.

The user can tough the metallic part with his thumb, keeping the screw driver tip in contact with the conductor to be tested.

When testing this way the user should stand in contact with the earth so that small current may flow to the earth through the body.

Neon tester working