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Questions about non-OEM leads set aside, why would you not expect them to measure differently at different frequencies?
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The difference between 1kHz and 10kHz is less then between 10kHz and 100kHz;
for the leads swe attachment; I think I've done a decent job, and there's no reading difference between the (calibrated) TL-21 and kelvins.
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Trying to get Lab-grade stability/accuracy out of any of these HH meters is a fool's errand.
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mnem
I don't look for lab grade measurement, but when I see gross(10%) errors instead of specs:
200.00µH 0.01µH 1.2%+5* 0.6%+3
200.00nF 0.01nF 0.3%+2 0.3%+2 0.3%+2 0.6%+3 (both lines copied from the manual)
I smell rat, no matter what kind of FUD or fight was before on the subject.