热导仪是一种通过测定宝石热传导能力来鉴别钻石真伪的电子仪器。
The thermal-detector is an electronic device which can measure the thermal conductance ability of gem, using to distinguish the jewelry.
铜是最好的热传导体，其导热能力约为铁的7倍，铁的导热能力是水的100倍，而水的导热能力是空气的25倍。
Copper is the best conductor of heat, having about 7 times the conducting power of iron, while iron conducts 100 times as well as water, and water has 25 times the conductivity of air.
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