The Atmos Jr and Titan 2 are excellent dry herb vaporizers. As an added bonus the Atmos Jr also handles wax and oil. We also love the Cloupor M1 for wax.

With the exception of unique vaporizers, like the Titan II, most vape pens can be used interchangeably. To use them interchangeably you must have parts that all use the same thread type. A 510 thread battery will generally work with a 510 liquid or solid material top chamber.  You just screw off one and screw on the other.