TheOsprey
Brewing Bad
Calibrate by comparing with a “reliable” thermometer? Is recirc arm same as whirlpool arm? My OG was only 1 out, according to my refractor (what a great gizmo)
Recirc arm comes with the kit, has a silicone tube on and sits on top of the mash to recirculate the wort through it.
The whirlpool arm is an optional extra, and is steel (I assume) to the bottom, and effectively recirculates the wort still, but in a clockwise/anticlockwise motion, to collect the trub in the centre. I haven't used it yet.