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Ampervoltommetr "Ts-438" since 1965 produced Zhytomyr plant "Electric meter". The combined device "Ts-438" is intended for electricians serving auto-blocking devices and electrical interlocking and is recommended instead of the device of type "Ts-760", as well as for electric communication mechanics. The device is designed to measure the strength and voltage of a direct current, the effective value of the force and voltage of an alternating current of sinusoidal and pulsed form, resistance to direct current. More details below.