When I need to cool a sample down for refractometer readings (first runnings, pre-boil, post-boil), I take a shot glass, and throw it in the freezer. By the time I fill it with 3 spoonfuls of hot wort, its right about at 65 degrees.
I don’t have a freezer nearby, so I use the same method I use for gravity readings. Put a small sample in a metal cocktail shaker and swirl it around in a bowl of ice water. In 30-60 seconds it’s down to room temp.
is this for mash pH or refractometer readings? I thought for a mash pH you would need to pull out an actual “mash sample” including grains, not just liquid… at least that is what I do… or is the pH of just liquid pulled from the tun good enough?