This is a light weight continuity tester designed to check the connectivity between two points in a PCB. Economical cell-Consumption. Continuity check of House Hold & Industrial Equipments. Can test Diode for open short. Can test transistor for open/short & PNP/NPN. Useful at indoor & outdoor work. Very versatile & Handy to T.V. Aerials open/short tests. Transformers, coils can be tested for open or short. Telephone line can be checked. Automobile wiring can also test.