Okay ladies and the occasional gentleman I am currently using a rather large coil for me something I'm not used to and it's dual coil for the Tengu rda. I'm used to itty bitty coils that heat up really fast. However this is making me paranoid the ohms are reading as they should for what they are and neither my ohms reader nor my regulated mod seem to be in any way bothered by the coils however when I'm trying to heat them up on the ohms reader they're making a vibration sound and it's kind of scary. I didn't notice it on the regulated mod I don't know if it did it I'm not really jazzed to put it back on there until I know why it's making the sound so I'm asking here why are they vibrating while I try to heat them up to make sure there's no hotspot.. is this something that happens or is this like an anomaly I imagine it's metal and it's heating up and sometimes that does cause an expansion right but I've never heard anything like this it's minor sounding but it's enough to Spook me