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Originally Posted by peterpan188
Measurements should including...ohmic values in single digit
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I'm not certain, but I think you can get accuracy better than 1 ohm on the Fluke 189. From my reading of the specs page, it looks like the worst case error on the lowest range is +/- 0.35 ohms.
This assumes you keep it calibrated, of course. Budget $50 per year for calibration services if maintaining this level of accuracy is important to you.
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I know there is something called 4 wires resistance measurement
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From what you wrote, I don't think you can afford 4 wire measurement. The cheapest name brand meter I'm aware of that will do that is a Keithley model 2000, which will run you over $1000 new.
You can find used 4-wire meters for less money, but they'll probably be less accurate than a Fluke 189, if they're in your price range.
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How much difference do 179 and 189 work out in real life?
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The 179 is a 6,000 count instrument, whereas the 189 is a 50,000 count instrument. All else being equal, that means that the 189 can give readings that are over 8x more accurate. All else probably isn't equal, but the main point remains.
If you're looking to save money, go with the 187 over the 189. I don't believe I've ever used the data logging feature of my 189, which I believe is the only thing it has over the 187.
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189 is the best DMM fluke makes.
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Ah, no.
This is the best DMM Fluke makes. It'll run you about $9,500.