The resistive measure is dissfunctional on a Instek GDM-8135 Digital Multimeter. Example: on the 2kΩ setting selected on the meter, the reading with a 1kΩ reads .01kΩ and with a 19kΩ resistance it measures 1.73kΩ with the meter range at the 20kΩ setting. Attempts to calibrate using table 4-3 in the owners manual adjusting pot number 401 as instructed had no response. Then I adjusted the 402 to see what would happen, and nothing. I am looking for the schematic diagram for the unit but of course to no avail for the obvious reason. The manual appearently did not have the schematic included. If anyone can instruct me at resolving this issue or has a way of attaining a schematic, I'll buy you dinner, if you live in Nashvill TN that is. Ha Ha. Thank You !!!!