I've been eyeing the Lavatube with the "4 amp limit" but want to know if something else exists that is a near equivalent? Would like the voltage to go up & down 0.1v increments, no stacked batteries, inexpensive, somewhat durable, but don't need a lcd readout, ohms, battery, voltage check since my tastebuds is all I think I need. The EGO-C twist is something like it, but it is a battery and unit all rolled into one correct? Being able to replace a battery for around $10 is also what I'm looking for too. I got a VV passthrough but it has only 4 settings and would also be nice to be portable.