Bigger is better for the smelting pot, I do batches rather than adding a little at a time to stay away from the fumes and avoid spatter. A thrift store perforated spoon and a good sized soup ladle work great. Be careful of plastic handles, this stuff is hotter'n my venison chilli. Another handy item is a point and shoot non-contact digital thermometer. I mark my alloy that has tin added by putting a green leaf in the muffin tin before pouring, leaves a fossil like impression.
Be sure to quarantine your equipment so nobody cooks for consumption with any of it.
