Now most miners buy Asic miner in China.However, if their purchase quantity is not particularly large, they basically cannot purchase directly through factories.Because factories generally only accept large orders, they do not accept orders with very few quantity.Such as bitmain and whatsminer.
So most customers buy through agents.Agents basically sell second-hand miner and brand new miner.
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For second-hand miner, we must be very careful. Because there are a large number of second-hand miners in the Chinese market. Their quality is different. If you are not particularly experienced, many agents may send you machines of poor quality. After you receive the goods, you may receive a machine that does not work properly at all.
For example, many agents advertise on facebook to sell miner at a very low price, but after receiving the money, they refuse the goods or send the goods of poor quality. Many miners are cheated in this way.So my suggestion is to understand the market price of a miner. If the price you buy is much lower than the market price, you should be careful.At the same time, before the agent delivers the goods, he must shoot a test video for you. The machine must be tested for at least half an hour, and the serial number of the machine must be included in the video.
There is no warranty for second-hand machines. Be careful.
For brand new machines, generally the factory will provide a half-year warranty, you only need to know that the quality of the machine is better. If there is a problem with the machine, you can directly send the machine to the factory for repair. I recommend that you try to select machines from large factories, such as bitmain and whatsminer.Their machines are of good quality and have maintenance centers abroad. Now it is difficult to send the complete machine to China, and it is very difficult for customs to pass.
Finally, some popular Asic Miners are introduced.antminer l3+ 504mh is popular for Litecoin miner.For bitcoin,Antminer S19 pro 110t, whatsminer M20s, these are of good quality.