Using external battery?
:grin:
First try to consider some off the shelf products:
Cheap : DT95B Pocket Digital Multimeter
expensive:
1. Mastech Ms8910 SMD Rc Resistance Capacitance Meter Tester
2. Extech Passive Component R/c Smd Tweezer Tester - RC100
3. Extech RC200 - MultiMeter with SMD Tweezer Component Test
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very expensive
Smart Tweezers™ = is a handheld LCR meter
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DIY solution.
1. Buy a microcontroller, 7 segments LEDs displays, operational amplifier circuits, resistors.
Make a digital voltmeter and a current source.
2. Buy a cheap mini-voltmeter, e.g. sold on eBay as 'Lipo Battery Voltage Indicator Checker' (usually $2-3).
Buy operational amplifier circuits, resistors... Build the current source, connect this on the voltmeter input ( it's possible to use a second operational amplifier to).
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To measure resistance – connect the unknown resistor across current source probes. Some current flows through the resistor, from constant current source. Now according to Ohm’s law voltage is produced across it. This voltage is directly proportional to its resistance. This voltage is buffered by the buffer amplifier and then fed to A/D converter, to get digital display in Ohms.