Transistorised Tester

These have been designed with a view of stronger and rugged construction of individual components, which have been tested by us for last so many years, and thus ensuring longer life of the instrument. The size and weight of this model has been considerably reduced with a view of making the instrument more handy. The indicating Instrument is specially protected seperately in a moulded case to prevent damages from dust at the time of servicing. The indicating instrument has knife edge pointer and Anti-parallax mirror scale for ensuring accurate readings. Single person operation push button control, no troublesome cranks to turn, usage of standard 1.5 volts pencil cells are all the special features.
ACCURACY : (+/-)5% of indicated value. 
WORKING PRINCIPLE : A push pull oscillator is used to convert DC voltage to AC, which is stepped up and further rectified to give the test voltage which is DC. A sensitive movement is used to detect the change in current due to insertion of resistance in the circuit. Available in various ranges from 10 to 500 Mega Ohms.