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Stir plate and flask

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Get a shaker instead. Worth the funds if you make a lot of starters.
+10 to that!
I acquired 2 (decommissioned) lab-grade (orbital) shakers from a homebrew friend. Still work wonders for yeast starters.

Aside from flasks, pretty much any type of jug or jar will work on a shaker.
In addition to 2 liter flasks I also use 1/2 gallon (64oz) pickle jars for starter vessels. I can fit 4 of those on one shaker. 1500ml starters is about the limit for that size jar, though, sloshing needs some headspace. ;)
 
A starter should be done days ahead of time, given time to "grow", then floc out, chill, and decant off the liquid so you can pitch the healthy yeast, not shake the whole thing and dump the oxidized beer/yeast mixture into your freshly made wort... you want the healthy slurry on the bottom of the container, not the whole works.

You can do a vitality starter that way, using some of the wort from your mash, allow that to get your yeast up and running while you do the rest of your brew day, gives them a jumpstart so to speak..
 
They can often be found on the FB Marketplace too. Finding one with heat can be harder but would be nice. They are usually lab quality though and not cheap.
 
Thanks to all. I was watching some Youtube vids on how to make one and they look pretty cool. Might give that a shot and use an old computer fan from a computer I have laying around. Gonna check out the links too and see what is there.
 
I made the DIY stir plate out of a computer fan and two strong little magnets super glued to the fan hub. Works great and cost less than $15. I made i little frame for the computer fans out of scrap wood. The fan assembly is slightly recessed - so the flask weight sits on the wood frame and doesn't scrape or slow down the fan blades.

The computer fan i got has the ac included with a small knob controlling speed.
 
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