The clear-tank disposable vape category has expanded quickly and some of the most premium disposable vapes on the market now feature a transparent shell that allows you to monitor the e-liquid level.  The Geek Bar CLR 50K, Lost Mary VIZ 55K, UT Clear Tank 50K, Foger Switch Pro, and Off Stamp X-Cube Crystal Cube all let adult vapor consumers see the remaining e-liquid, but they handle power, airflow, battery design, screens, and replaceable hardware very differently. This comparison loo …