I wouldn't recommend an IR gun. I piloted and tried to validate the gun for blood products and the degree of difficulty is what made me cancel the validation. When you use the gun, you have to take into account of a few things for an accurate temperature reading. Emissivity, the type of material of the bag, the texture of the bag, the distance from what you are sampling, making sure the gun has adjustable emissivity settings, the angle of the bag when sampling, the brightness of the light in the room, is the bag shiny or not. And no I am not making this up. I ended up getting something called a TC -3 TempCheck. It is designed for blood bags and its a pleasure to use as well.