Then you squish the juice out - this is low tech way. In a proper winery they do have a more sophisticated way of doing this.
Syrah juice ready to test.
2-3 drops go on the little screen, then you look in the eyepiece and read off the number (can't take a photo sorry).
And since there is always loads of juice left, my favourite part is drinking it afterwards. The Flora and Pinot Gris is at 23% at the moment, so we are wanting to pick it asap, hopefully this Thursday or Friday. The Syrah is a 20%, it is always later, and we want to pick it at a higher sugar content anyway, so maybe a couple of weeks off yet.
I'll take my camera down to the vineyard soon - it is looking so gorgeous with all those lovely luscious bunches of grapes hanging there.