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regarding measuring low resistance of points
No two wire meter will do a good job measuring below 1 ohm. The leads themselves have too much resistance to get any kind of accurate number. You can tell if they are bad and have high resistance and improved with cleaning but how clean will be difficult to tell. An accurate meter for this purpose is a four wire meter determine the final cleaning of the contacts, we have an industrial one at work that is somewhere around $5,000, a bit pricey for the home hobbyist though. This one from china may be reasonable:
http://www.ebay.ca/itm/NEW-VC480C-3-1-2 … 45fe07309e
It also measures capacitance so might be a good choice vs some of the other meters that measure capacitance but are two wire ohm meters.