There are four pieces of advice:
1. To be targeted. If you want to detect gold, buy this instrument in Junhong Technology&Electronic Co., Ltd. to buy a large company that you can choose a more sensitive to detect gold, like GF2, FS2.
2. Choose the correct sales merchant. , firstly, it can guarantee the quality; secondly, it have a better after-sales service.
3. There is a lot of change in the requirements here. The best one is fit for their own. The detecting depth depends on the size of the object. You must be clear about The principle of choosing products. You have to do a simple judgment about your wanted depth.
4. The price should be reasonable.