The ability to zero an ohmmeter has no effect on its accuracy or precision. The real question is, 'can your meter distinguish between a resistance of, say 0.1 ohms and 0.05 ohms? Most can't.
Back when I was a tech rep at Bell Helicopter Amarillo working on AH-1S Cobras, there was an EMC issue with the Helmet Sight System interfering with some other avionics. The EMC guys determined the HSS wasn't grounded well enough, and that its control box needed to be bonded to airframe with less than something like 10 milliohms resistance. Obviously, the electricians' Simpson 260s weren't going to make that measurement. My colleague took a DMM out of the metrology lab, set it up for four-wire ohms, and was easily able to measure down to one milliohm.
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Today's Featured Article - History of the Field Marshall Tractor - by Anthony West. Any restorer who has some knowledge of turn of the century farm machinery, will recognize the name Lanz Bulldog!! This machine was to say the least unusual in its appearance. The huge flywheel and coffee percolator shaped exhaust. Along with square body lines and cylinder head protruding forward of the front axle. Would become the visual differentiation that people would quote to separate the Lanz from other period machines. The Marshall company based at the Briannia Works in Gainsborough
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