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	I measure casting. Iron, aluminum, brass etc. Why, I am using external contact type, but sometimes it does not light up.
	Cast iron, aluminum, brass, etc. originally flowed electricity, but when the surface temperature is high when taking out from the sand mold, the outer surface reacts with oxygen and turns into oxide.
	In the case of castings, when taking out from the mold well cool it out, or put it in water immediately, cool it then put into processing, if you can use energizing formula, if you can not, please use the internal contact type. If hot heat is transmitted to the inside, the electronic board will be damaged. The heat resistant temperature of the electronic parts mounted on the board is -50 to 70 ° C. If it exceeds this, it will be broken.
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