Seeking Feedback - How often have you used a Low Resistance Micro-Ohmmeter?

That's correct for shielding, I specifically mentioned just checking "resistance quality" (i.e. a maintenance operation) some may miss that! : )

I've used bridge circuits to measure hot film and nano wire probes.  At Bosch we used them to measure relay contact resistance.

I think relays is one of the top use.

I've wondered if one could be used to monitor the condition of copper AFILS loop tapes. One of the problems I often see is water ingress rapidly corroding them due to the close proximity to concrete. (Another is damage from carpet fitters knives during carpet repairs.) However they are often laid under expensive floor coverings which makes routine inspection difficult and expensive. Being able to monitor the condition routinely would allow for scheduling a repair before it failed completely.

Interesting use! Maybe the inductance may be an issue, although some meters may be more stable than others. Presumably the industrial meters are more immune to that.

Also, some meters may use a slow AC measurement I guess, although others use DC (such as Frank's one). That might not be an issue though.

You would need to have a base reference of the loop.

Could be heard, I guess.

I've never used one. Once I had to check copper thickness on a prototype board and I used a resistance measurement (1A current from a lab power supply and measured voltage drop with a multimeter) to indirectly calculate the overall copper amount. I guess it would've been useful in that situation!

I've never had one but have measured low resistance by 4 wire method using power supply (to provide current) and DMM to measure voltage drop on a few occasions.

I don't do much high current work so I've not often been interested in measuring very low remittances.

MK