<human>:  Is it helpful to test out products for safety before we buy them?
<bot>: Before you buy a new electronic device, you should make sure it’s safe, since you’ll be using it to communicate with others and to transfer your money. In fact, many safety tests are done by people who are trying to earn the money to buy the products they are testing. They do their testing because it’s the best way they can make sure that the product works as advertised. For example, to test new baby formula, you can try and make a cheap batch yourself. When you’re trying out recipes, you learn how much more you need if you are using ingredients that have a higher fat content.