Searching For Best Rheostats On Earth...

Any advice...

ranges:

.....20 Ohm
.....50 Ohm
....100 Ohm
....200 Ohm



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Have you checked digikey or mouser? Both would have them. As far as the best on earth, I'm not sure how you would gauge that. I suppose you could find one with an extremely low tolerance. Then you could consider voltage and amperage requirements to find one that works.