Vert You cannot test if the calibration is correct based on it showing 0.26mV when nothing is connected. It is probably a real reading of small amounts of static electricity. If you touch each of the probes to each other, however then it should read 0mVRegarding the capacitor test electrolytic capacitors can vary by 20% or more and still be within their specs. 6.8uF -20% = 5.44uF and maybe the capacitor is old and lost a bit of capacity, in that case 5uF might be a correct reading.
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