I agree the Fogger 4 and 4+ are better than the Kayfun in airflow and vapor production, however.... For someone just learning to build
coils, 1 might be hard enough to get right or consistent..... 2 might be a bit overwhelming. I would defiantly tell everyone to keep it in mind for a future purchase. Master 1 consistently before trying 2, and so on.
As for needing an Ohm's checker and which Kayfun.... I say YES, you need some way to verify your build. You can use a multi meter if you have one that's accurate, or buy a checker with a 510 on it, even use a protected MOD with a reader(not really recommended though). These all have benefits and drawbacks, the multimeter will do a lot more than a basic checker, but lacks a base to help hold your atty while you build it, and the MOD as your only checker.... what if it's wrong or you get eager and forget to check? I tend not to put an atty on a device until it's ready to be on there. The Kayfun's I still have are the EHpro lite+ and Hcigar 3.1, I recommend Hcigar simple because of the parts you can buy if need be. The Hcigar and authentic parts would never work well in my EHpro and I could never (even now) find back-up EHpro parts for that kayfun. I would tell you to stay clear of the
fast tech stuff, the ones I had all had leaking or wicking issues, some of these were no big deal to fix with a small grinder bit, but I'd assume you'd like to vape it, not fit it... right? LOL