I drop the mouse in a cup with hot tap water and a probe thermoter (don't tell my wife!). The water temperature drops pretty quickly as the mouse warms up, but as the mouse and water reach equilibrium, the temperature stops dropping rapidly. If the temp is below 105*, I add more hot water. If it's still above 105*, then I pick the mouse out, dry it off and take it upstairs to feed. By the time I have the snake out and in his feeding bin, I'm sure the mouse temp has lowered to just above 100*. I'm still on pinks, so this works good for me. When I move up to larger mice, I'm sure I'll have to alter this, or at least regularly dump some water and add fresh hot water before the temp stabilizes at the right place.