Whip out your multimeter and measure. Don't have one, get one they are inexpensive. $20 or so at home improvement store of your choice (Lowes, Home Depot, etc.).
Could drag out a magnifying glass and look. Higher ohm coils would have more loops or thinner wire.
1. I'm sure you have a friend or neighbor who has a multi tester. If you are going to play at all with coils, a multi tester is invaluable. And you can test regular batteries, fuses. I wouldn't be without one. I have 3. Harbor Freight has one for under $7.
2. If you get different ohm coils, I'd mark them. Take a small sharp file, and under the condom, file one small scratch, or two scratches, then 2 on one side, one on the other, then 2 on each side, and write down which are which. Make sure you clean the filings, but you are only putting a small mark.
3. You could trim about 1/8 inch from one side of the coil wick, and that will show the difference.
Me thinks Dave is behind the idea of having a multi meter.... and he's right.. they're great! But the idea of marking them is pretty smart as well... I might steal that for when I'm traveling and Didn't pack my MM... (Hey, gotta stay under the 50# bag limit or the missus will kill me when we fly!)
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