I have bought the multimeter with temperature measurement from the following website:
Currently I use the voltage, resistance, and short circuit detection functions on it.
The short circuit detection function works fine. but now when I measure high resistance values over 100K, the results are inaccurate. For example, the 560K resistor was measured at 408 instead of 560 on the meter (I turned the knob to the 2000K setting). When I measured a 1K resistor, the meter reported 0.8 instead of 1.0 on the 200K setting.
All resistors measured were carbon film 1/4 watt with 5% tolerance.
One time when I opened up a multimeter to replace the battery, I noticed it had a fuse and a potentiometer as part of its circuit.
Would adjusting the potentiometer fix this issue? I mean the low battery symbol never appeared on the meter so I don't know if battery is an issue. Could I hack the meter somehow and measure something that could give me an indication if the battery is dying?