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The electrical instrument type "TL-4" was produced since 1965. The electrical measuring instrument of the type "TL-4" is an ampervoltommetr designed to measure in a wide range the voltages of direct and alternating current, as well as resistance in various electrical circuits. See the documentation below for details. Since 1981, the device was manufactured "TL-4M", and since 1987 the device "TL-4M2" with the addition of functions for measuring parameters of transistors. Other information on these devices yet.