Has anyone tried this laser thermometer? You can't use it on a reflective surface like aluminum.. I was thinking since I use a metal crucible, I could take the temp of the crucible, and be close enough, or make an adjustment.. Amazon.com: BTMETER BT-1500 Non-Contact Pyrometer 30:1 Industrial Laser Thermometer Gun, -58℉ to 2732℉ (-50℃ ~ 1500℃) High Temp Infrared Thermometer (NOT for Human) : Industrial & Scientific