The Gofire vaporizer looks like a walkie-talkie with a mouth groove on top. Hardly as sleek as other, more discreet weed vapes, it packs weight, literally: It’s over half a pound, about five inches tall, and nearly an inch thick. And at $349 (a preorder special deal) it carries a much heavier price tag than many other devices. But the result, the company believes, is worth the cost. Not only does it tell you exactly what’s in the cartridge — information that’s especially important as the industry grapples with a wave of mysterious illnesses that have led to at least three deaths — it’s designed to give you accurate dosing, so you know exactly what you’re getting every time.