1. Can they stand up to tough conditions?
A coaxial component and a bidirectional coupler will often be asked to endure a great deal of stress when they are in use. You obviously do not want the items you buy to fail in the middle of an important task. You need to make sure that the components you buy are completely reliable. Otherwise, you will end up needing to buy more components in the future. This is something that you can avoid by doing some research on the durability of the various types of coaxial components.
2. Bulk discount
You might own a company that has a frequent need for coaxial components to be used in the various tasks that you need to perform. If this is the case, it would be in your best interests to seek out a dealer who would be willing to give you a bulk discount. In other words, the dealer will lower the price of the coaxial components if you agree to buy a certain number of them. This sort of arrangement could save you a large sum of cash over an extended time period. You have nothing to lose by asking different dealers if they would be willing to make that sort of deal.
3. Can you get your money back?
You may find out that you do not need all of the coaxial components that you have purchased. There is also the chance that you are not happy with the performance of that particular brand. In these cases, it is essential that you are able to receive a full refund from the dealer with no questions being asked. Talk to previous customers and find out if they had trouble getting a refund when they requested one.