• Understanding cartridge threading is the most overlooked step when buying a CBD vaporizer. Most pens use 510 threads, but not all cartridges fit all batteries, and a mismatch means a dead gift. Check the thread type and cartridge length before you buy, and you'll save yourself a lot of frustration.
• The 510 thread is the industry standard, but it's not the only option.
• Battery and cartridge must match in thread type and, ideally, in diameter.
• Cartridge length matters for aesthetics and functionality—too long can look awkward, too short can sit flush.
• A simple adapter can solve many compatibility issues, but know its limitations.
• When in doubt, stick with brands that explicitly state compatibility.