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You cannot acuractely messure the resistance of a a resistor in circuit. For example, If you are using a low budget dvm from radio shack or the like those meters at best have a 10MOhm impedance which will load down a circuit severly. Another problem is that if you don't have a schematic to compare to you might think you're measuring just the resistors value but it can infact be in series or parellel with some other component. So the appropriate way to test the resistor box is to disconnect it from the circuit and then take measurements.