The Ascent lets you dial in temperature (from 38 to 430 degrees) to account for different herbs. Its chamber flips out and fits either loose leaf or concentrates; its retractable glass pipe provides a smooth draw. Testers liked the palm-friendly size, long battery life, and high level of control, but hated how dirty the Ascent's rubber chamber became and found its vapor weak. [$250; davincivaporizer.com]
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