I would recommend getting a stand alone Taylor cylinder such as the ones included in the TF100 rather than the integrated cylinder/pH comparator found in the taylor K-2006. It will fit on your stirrer better and be easier to use. http://www.taylortechnologies.com/produ ... artID=2012
Any stir bar 1" or less will fit. The 1 x 3/8 seems to be the most common one that people use.
I have tried several sizes and prefer the 1/2 x 1/8 inch stirbars. They are small and do not hit the sides of the tube if not centered perfectly but they create a good vortex.
I have found the best prices for just a few stirbars on eBay (check the eBay stores). Most lab supplies only sell them in large packages or charge very high prices for a single bar.
Apologies in advance since the following is very likely bordering on a "hijack".
Paul is indeed a great guy. I recently sent a post asking for help with my son's chem project, and Paul spent a good deal of time helping via PMs, meaning he didn't get proper credit here. First A my son's gotten in Chemistry, largely due to Paul's help.
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