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Tester of electronic tubes "L3-3" was produced since 1970. It is designed to check the validity and control parameters of receiving-amplifying and low-power generator (with an dissipation power at the anode up to 25 W) of lamps, kenotrons, diodes and zener diodes. The type of the instrument to be tested is set by installing the corresponding cardboard card from the set on the type-setting field of the device, where pin switching of voltages and indication circuits connected to the electrodes occurs. The device could be used in warehouses and bases of consumers of electronic tubes, in repair shops, laboratories, as well as at enterprises developing and producing radio engineering equipment.