Most small refining and smelting furnaces don't include temperature indicators. A Laser Temperature gun will allow you to determine the temperature in the furnace, and actually determine the difference between the furnace temperature and the temperature of the molten material:
A valuable tool to assist in temperature measurement. More details and pictures here:
Digital 50:1 Pro IR Thermometer Gun 1650°C 3002°F
A valuable tool to assist in temperature measurement. More details and pictures here:
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