The problem is not in the probes..i tried with many pairs.
Also, a while after power on it indicates 0.00 ohm even with 0.33 ohm resistors..
both my Uni-T, when measuring a short "0.ohms" still get 0.17ohms with the short probes, 0.33ohms with the long, using the UT601.
so a 0.33ohm resistor should measure 0.66ohm, no big deal, bigger resistors do not have that problem,
the UT601 has a capacitance adjust knob outside the unit to fine tune the UT601 when working in the <200pF~20nF range "No shorted probes needed, but probes change/affect the capacitance upto the 200nF range.", coincidence that the photo was taken at 200nF ? or just a lazy photographer that didn't have the time to tweak the 0 adj.knob.?
In the UT70A, with a short, the long probes measure -00.3ohm, and -00.6ohm with the small, in the lowest ohm range.
just internal calibration, problem is... no service manual to know what to tweak.