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The combined measuring device "ABO-63" (School) was produced from the beginning of 1963. The combined measuring device '' ABO-63 '' (School) is designed to measure DC and AC voltages from 0 to 1000 volts, DC and AC currents from 0 to 500 mA, and resistance from 1 Ohm to 2 Megohms. Manual measurement mode switching by inserting a phase probe into the corresponding socket. There is a switch for measuring fixed or variable values "‹"‹and a controller for displaying the end point on the scale when measuring resistances. The accuracy class of the device is 2.5. The power for operation of the device ohmmeter consists of 3 elements: FBS-0.25, 1.3-FMTS-0.25, 332 or 336. In 1977, the device was updated, receiving a case of unbreakable plastic and a new dial gauge. The device was without a lid like the previous one, but it had an iron case in gray and blue in color, with a closing lid. The device was named as "ABO-63" (Training).