Don’t say I did not warn you: The Kindbright Petri RTA clone is available for $16.99 and you might want to get this one. Why? Fasttech and Focalecig have pulled all Petri RTA clones, so not sure how long they are available.
Focalecig had the ShenRay version, but Kindbright does some pretty good stuff normally too. So this one is worth a try.