For the newer Micro Power with a little squarish coil supplied by Boyer, primary impedance should be 0.6 ohms. You'll need a good digital tester with a Rx1 ohm range setting to measure that; cheap testers won't give reliable results for impedance that low. First disconnect the coil. Then clean the probes, set the meter, touch the probes together to find their latent resistance (often as much as 0.2 ohms), and touch the probes to the primary terminals. Subtract latent resistance from the reading and you have primary coil impedance. If the result is a little to the high side of spec by a couple tenths of an ohm, that's fine. If it's at all to the low side, clean probes, recheck latent resistance, recheck coils, and if the result repeats, change the coil. If you're using the older Micro Digital ignition, your primary impedance will depend on the coil you're using. Boyer's recommendations wandered a bit over the years, but coils with primary impedance of 3.5 to 5 ohms will work. In my experience the system works better with coils rated from 4 to 5 ohms. Use the same procedure given above.
To check secondaries, you'll need a meter with a high impedance setting. Remove the spark plug caps; this time don't bother measuring latent resistance, it's not significant. Touch one probe in each coil wire socket simultaneously, or, if your wires are permanently fixed to the coil, push a probe into each plug wire end. A reading in the neighborhood of 30K ohms +/- 10% is usually good with conventional coils; specifics depend on manufacturer's specs, but what you're looking for is an extremely low reading that would tell you that secondary windings have shorted, or an extremely high reading that would tell you that windings have burned out or broken.