Linear scale ohmmeter circuit

The probe capacitor polarity needle has a head diameter of 5.8. The total length of the 7-pin and 12-pin needles is 5.

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As shown in the figure is a linear scale ohmmeter circuit. The purpose of designing this circuit is to measure the resistance accuracy and read it out on a linear scale. He has four ranges. The meter uses any ammeter with a sensitivity of 10KΩ/V and a current range from 10υA to 10mA.