Wismec’s Theorem RTA was in part designed by the “reviewer” in the video below. He does a full breakdown on this RTA, including everything you need to know about it. It is 22mm in diameter. Everything you need to use it is included, plus many extra parts and accessories. Some major extras include an extra glass tube that presents all inner components and e-liquid level clearly, plus an airflow control ring that you can rotate clockwise or counterclockwise.
The video review demonstrates how to properly build the Theorem RTA to use atop your specific vape mod. He explains the airflow option. There are two slots to open and close for your optional airflow to be more or less of a restrictive vape. He displays how to properly wick the Theorem RTA to avoid any leakage. The flavor and vapor production was above average with this RTA. Of course he recommends the Theorem RTA because he helped design it, but says that it caters more to the vaper who likes a direct lung hit. When both air flow slots are open is when you get the largest direct lung hit. When they are closed, you get more of a mouth-to-lung draw.
Wismec Theorem RTA on sale for $15.90
WATCH The Video Review: