a nice guide of professional reviews of DMMs:
https://lygte-info.dk/info/DMMReviews.html
for resistance measurements (mΩ), i use Vapcell YR1030 (
https://lygte-info.dk/review/InternalResistanceMeterYR1030 UK.html , around $34), because of its resolution (~1mΩ) and because it uses 4 terminal leads (alligator clamps or probes, like showed at
https://lygte-info.dk/review/InternalResistanceMeterYR1035 UK.html ); this is very comfortable: you don't have to subtract leads resistance, and measurements are more stable.
i use UNI-T UT61E for voltage (mV) measuring.
anyway, you can use a cheaper dmm as well. here is an example using a $22 DMM (ZOYI ZT109, 2 decimal points at Ω, 10mΩ resolution), with very low resistance clamp leads (they didn't come with the dmm). you have to wait until reading is stable.
1. calibration: ~10mΩ (0.01Ω) leads resistance
2. measurement of $20 cable, 2.5mm balanced, left+ signal:
0.11Ω - 0.01Ω (leads resistance) = 0.10Ω (100mΩ).
absolute error of this measurement: ~15mΩ
edit: corrected prices of gear..
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