It is difficult to make precise contact to get jumping readings everywhere. In too many cases it is not possible to accurately confirm the KT of gold. Also, the probe is not durable and expensive to replace. I would like to add that the connections on the machine, for example plugging them into a socket, are very poorly made. You have to wiggle until you have constant contact. I bought it 2 years ago when I didn't know at all. WOULD NEVER SUGGEST IT, now I'm more aware.
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