lol the response ratio of speed stirrer to AF test kits is running at about 5:1........
The Taylor speed stir's are bought in america, but you'll need to find a seller who will post to you or use a mail forwarder:
https://www.amazon.com/Magnetic-Stirrer-Speedstir-Start-Up-Batteries/dp/B004BGPC5W
I bought mine from a bloke on one of the aussie facebook groups who brought a bunch in to on-sell. At $70AUD posted, with an additional three small stir bars it was good value. They are wicked little things though: