Great for vineyard and tank sampling, and for use as a reaction vessel for TA Testing. Especially when determining the endpoint by pH, the larger vessel ensures you have room for a pH electrode, temperature probe and can still easily add your Sodium Hydroxide with ease.
Laboratory grade borosilicate glass can be rapidly heated or cooled without cracking and is generally shatter resistant.
I was skeptical at first due to the small size but I actually use this thing quite a bit. Everything from rehydrating dry yeast, cooling wort for SG readings, sampling wort, starch conversion, or even just to freak my neighbors out by drinking beer out of. Grab up a couple while you're at it and take your brewing nerdiness to the next level.